Filed Pursuant to Rule 424(b)(5)
                                               Registration No. 333-74874
                                                                333-74874-01
Prospectus Supplement
(To Prospectus dated December 14, 2001)

[LOGO]
ALCOA

Alcoa Inc.
$800,000,000 4.25% Notes due 2007

$600,000,000 5.375% Notes due 2013


The 2007 Notes will mature on August 15, 2007 and the 2013 Notes will mature on
January 15, 2013. Interest will accrue from August 13, 2002. Interest on the
2007 Notes is payable February 15 and August 15 of each year, commencing
February 15, 2003. Interest on the 2013 Notes is payable January 15 and July 15
of each year, commencing January 15, 2003. The notes are redeemable in whole or
in part at the option of Alcoa and in whole if certain events occur involving
U.S. taxation. See "Description of the Notes--Optional Redemption" and
"Description of the Notes--Tax Redemption." The notes will be offered and sold
in multiples of U.S.$1,000.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus supplement or the prospectus is truthful or complete. Any
representation to the contrary is a criminal offense.


             ------------------------------------------------------
                           Price to      Underwriting Proceeds to
                           Public        Discounts    Alcoa
             ------------------------------------------------------
                                             
             Per 2007 Note 99.670%        .350%       99.320%
             ------------------------------------------------------
             Total         $797,360,000   $2,800,000  $794,560,000
             ------------------------------------------------------
             Per 2013 Note 99.367%        .450%       98.917%
             ------------------------------------------------------
             Total         $596,202,000   $2,700,000  $593,502,000
             ------------------------------------------------------


Application has been made to list the notes on the Luxembourg Stock Exchange.

The underwriters have agreed to purchase all the notes if any notes are
purchased. We expect that delivery of the notes will be made to investors on or
about August 13, 2002 in book-entry form only through the facilities of The
Depository Trust Company for the accounts of its participants, including
Clearstream, Luxembourg or the Euroclear System.

                               -----------------

                               Joint Bookrunners

Credit Suisse First Boston                                 Morgan Stanley

                               -----------------

ABN AMRO Incorporated
                Banc of America Securities LLC
                               Deutsche Bank Securities Inc.
                                              JPMorgan
                                                           Salomon Smith Barney

Australia and New Zealand Banking Group Limited
           Banca IMI S.p.A.
                      Bank of Montreal
                                   BNP PARIBAS
                                             Caboto IntesaBci
                                                         Commerzbank Securities

August 8, 2002



                               TABLE OF CONTENTS

                             Prospectus Supplement



                                                                      Page
                                                                      ----
                                                                   
     About this Prospectus Supplement................................  S-3
     Where You Can Find More Information.............................  S-4
     Incorporation by Reference......................................  S-4
     Cautionary Statement Regarding Forward-Looking Statements.......  S-5
     Alcoa Inc.......................................................  S-6
     Capitalization..................................................  S-8
     Ratios of Earnings to Fixed Charges.............................  S-8
     Use of Proceeds.................................................  S-9
     Directors and Executive Officers................................ S-10
     Selected Historical Financial Data.............................. S-11
     Description of the Notes........................................ S-13
     United States Taxation.......................................... S-20
     Underwriting.................................................... S-24
     Legal Matters................................................... S-25
     General Information............................................. S-26

                                  Prospectus

                                                                      Page
                                                                      ----
     About this Prospectus...........................................    3
     Where You Can Find More Information.............................    3
     Incorporation by Reference......................................    4
     Alcoa Inc.......................................................    5
     Alcoa Trust I...................................................    6
     Ratios of Earnings to Fixed Charges.............................    7
     Use of Proceeds.................................................    7
     Description of Senior Debt Securities...........................    8
     Description of Subordinated Debt Securities.....................   22
     Description of Preferred Stock..................................   29
     Description of Common Stock.....................................   33
     Description of Warrants.........................................   35
     Description of Stock Purchase Contracts and Stock Purchase Units   37
     Description of Trust Preferred Securities and Trust Guarantee...   38
     Plan of Distribution............................................   42
     Legal Matters...................................................   43
     Independent Accountants.........................................   43


                                      S-2



                       ABOUT THIS PROSPECTUS SUPPLEMENT

This document is in two parts. The first part is the prospectus supplement,
which describes the specific terms of the notes we are offering and certain
other matters relating to us and our financial condition. The second part, the
base prospectus, gives more general information about securities we may offer
from time to time, some of which does not apply to the notes we are offering.
If the description of the notes in the prospectus supplement differs from the
description of the senior debt securities in the base prospectus, the
description in the prospectus supplement supersedes the description in the base
prospectus.

You should only rely on the information contained or incorporated by reference
in this prospectus supplement and the prospectus. We have not, and the
underwriters have not, authorized any other person to provide you with
different information. If anyone provides you with different or inconsistent
information, you should not rely on it. We are not, and the underwriters are
not, making an offer to sell these securities in any jurisdiction where the
offer or sale is not permitted. You should not assume that the information
appearing in this prospectus supplement is accurate as of any date other than
the date on the front cover of this prospectus supplement. Our business,
financial condition, results of operations and prospects may have changed since
that date.

The distribution of this prospectus supplement and prospectus and the offering
of the notes in certain jurisdictions may be restricted by law. This prospectus
supplement and prospectus do not constitute an offer, or an invitation on our
behalf or on behalf of the underwriters or any of them to subscribe to or
purchase, any of the notes, and may not be used for or in connection with an
offer or solicitation by anyone, in any jurisdiction in which such an offer or
solicitation is not authorized or to any person to whom it is unlawful to make
such an offer or solicitation. See "Underwriting."

The prospectus supplement and the prospectus include particulars given in
compliance with the rules governing the listing of securities on the Luxembourg
Stock Exchange for the purpose of giving information with regard to Alcoa Inc.
(also referred to as "Alcoa"). Alcoa accepts responsibility for the accuracy of
the information contained in this prospectus supplement and the accompanying
prospectus and confirms that, to the best of its knowledge and belief, there
are no other facts the omission of which would make any statement herein or in
the prospectus misleading in any material respect. The Luxembourg Stock
Exchange takes no responsibility for the contents of this document, makes no
representation as to its accuracy or completeness and expressly disclaims any
liability whatsoever for any loss howsoever arising from or in reliance upon
the whole or any part of the contents of this prospectus supplement and related
prospectus.

We cannot guarantee that listing will be obtained on the Luxembourg Stock
Exchange. Inquiries regarding our listing status on the Luxembourg Stock
Exchange should be directed to our Luxembourg listing agent, Deutsche Bank
Luxembourg S. A., 2 Boulevard Konrad Adenauer, L-1115 G.D., Luxembourg.

All references in this prospectus supplement to "U.S. dollars," "dollars,"
"U.S. $," or "$" are to the currency of the United States of America.

                                      S-3



                      WHERE YOU CAN FIND MORE INFORMATION

Alcoa files annual, quarterly and current reports, proxy statements and other
information with the Securities and Exchange Commission (the "SEC"). Its SEC
filings are available over the Internet at the SEC's web site at
http://www.sec.gov. You also may read and copy any document it files with the
SEC at the SEC's public reference room at 450 Fifth Street, N.W., Room 1024,
Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for more
information on the public reference room and its copy charges. Alcoa's common
stock is listed and traded on the New York Stock Exchange (the "NYSE"). You may
also inspect the information it files with the SEC at the NYSE's offices at 20
Broad Street, New York, New York 10005. So long as the notes are listed on the
Luxembourg Stock Exchange, copies of the periodic reports that Alcoa files with
the SEC will be made available without charge at the offices of Deutsche Bank
Luxembourg S.A., 2 Boulevard Konrad Adenauer, L-1115 G.D., Luxembourg.

                          INCORPORATION BY REFERENCE

The SEC allows Alcoa to "incorporate by reference" the information in documents
it files with the SEC. This means that Alcoa can disclose important information
to you by referring you to those documents. Any information Alcoa incorporates
in this manner is considered part of this prospectus supplement. Any
information Alcoa files with the SEC after the date of this prospectus
supplement will automatically update and supersede the information contained or
incorporated by reference in this prospectus supplement.

Alcoa incorporates by reference the following documents that it has filed with
the SEC:

..  Annual Report on Form 10-K for the fiscal year ended December 31, 2001;

..  Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31, 2002
   and June 30, 2002; and

..  Current Reports on Form 8-K filed on March 19, 2002, July 1, 2002, July 17,
   2002 and August 7, 2002.

Alcoa also incorporates by reference any future filings it will make with the
SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of
1934 after the date of this prospectus supplement, but before the end of the
offering of the securities made by this prospectus supplement.

You may request a copy of any filings referred to above (including any exhibits
that are specifically incorporated by reference), at no cost, by contacting
Alcoa at the following address or telephone number:

                                  Alcoa Inc.
                             Attention: Treasurer
                                390 Park Avenue
                         New York, New York 10022-4608
                           Telephone: (212) 836-2600

Copies of the filings referred to above will also be available without charge,
so long as the notes are listed on the Luxembourg Stock Exchange, at the
offices of Deutsche Bank Luxembourg S.A., 2 Boulevard Konrad Adenauer, L-1115
G.D., Luxembourg.

                                      S-4



           CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This prospectus supplement and the accompanying prospectus include and
incorporate by reference certain statements that may be deemed to be
"forward-looking statements" within the meaning of the Private Securities
Litigation Reform Act of 1995. Forward-looking statements may be identified by
their use of words like "anticipate," "believe," "estimate," "expect,"
"intend," "should," "will," "will likely," "forecast," "outlook," "projects"
and similar expressions, as they relate to Alcoa or the management of Alcoa.
All statements that address expectations or projections about the future,
including statements about Alcoa's strategy for growth, cost reduction goals,
expenditures and financial results, are forward-looking statements. Such
statements reflect the views of Alcoa with respect to future events, the
outcome of which is subject to certain risks. These forward-looking statements
are also subject to uncertainties and assumptions relating to the operations
and results of operations of Alcoa. Should one or more of these risks or
uncertainties materialize, or should underlying assumptions prove incorrect,
actual results or outcomes may vary materially from those described in the
forward-looking statement.

The following important factors, along with those discussed elsewhere in this
prospectus supplement, the accompanying prospectus and in the documents that we
incorporate by reference, could affect the future results of Alcoa, and could
cause those results to differ materially from those expressed in the
forward-looking statements:

..  materially adverse changes in economic or industry conditions generally or
   in the markets served by Alcoa;

..  changes in the supply and demand for and the price of aluminum, alumina,
   aluminum products and other products;

..  operating factors such as supply disruptions, the failure of equipment or
   processes to meet specifications, changes in operating conditions,
   substantial increases in energy or other raw material costs, the
   availability of energy, and weather;

..  political and economic risk associated with Alcoa's foreign activities,
   including political instability in relevant areas of the world and
   fluctuations in foreign currencies;

..  failure to complete capital projects as scheduled and within budget;

..  failure to successfully launch or complete new growth or strategic business
   initiatives, including acquisitions, divestitures or strategic alliances, or
   the failure of such initiatives to be beneficial to Alcoa;

..  inability to achieve the level of cost savings or productivity improvements
   anticipated by Alcoa's management, including possible increases in the cost
   of doing business resulting from war or terrorist activities;

..  material changes in available technology, failure to successfully implement
   new technology or failure of developmental technology, including Alcoa's
   inert anode technology, to be commercially feasible;

..  labor relations, including the failure to reach agreement on new labor
   contracts;

..  environmental risks and liability under federal, state and foreign
   environmental laws and regulations;

..  changes in laws and regulations, both U.S. and foreign, or their
   interpretation and application, including changes in tax laws and
   interpretation and application of tax laws;

..  unanticipated legal proceedings or investigations or the disposition of
   current proceedings, including those pertaining to environmental, product
   liability and safety and health matters, other than as anticipated by
   Alcoa's management;

..  relationships with and financial and operating conditions of customers or
   suppliers; and

..  the actions of competitors.

                                      S-5



                                  ALCOA INC.

Formed in 1888 under the laws of the Commonwealth of Pennsylvania, Alcoa has
its registered office in Pittsburgh, Pennsylvania. Alcoa changed its name
effective January 1, 1999, from Aluminum Company of America to Alcoa Inc.

Alcoa is the world's leading producer of primary aluminum, fabricated aluminum
and alumina, and is active in all major aspects of the industry: technology,
mining, refining, smelting, fabricating and recycling. Alcoa serves customers
worldwide in the packaging, consumer, automotive, aerospace and other
transportation, building and construction, industrial products and distribution
markets. Related businesses include packaging machinery, precision castings,
vinyl siding, plastic bottles and closures, fiber optic cables and electrical
distribution systems for cars and trucks. Alcoa is the ultimate parent for a
group of companies, including subsidiaries and equity entities. Alcoa has
129,000 employees in 38 countries.

Alcoa's operations consist of five worldwide segments: Alumina and Chemicals,
Primary Metals, Flat-Rolled Products, Engineered Products and Packaging and
Consumer. Alcoa businesses that are not reported to management as part of one
of these five segments are aggregated and reported as "Other."

Alumina and Chemicals--This segment consists of Alcoa's worldwide alumina and
chemicals system, that includes the mining of bauxite, which is then refined
into alumina. Alumina is sold directly to internal and external smelter
customers worldwide or processed into industrial chemical products. The
industrial chemical products are sold to a broad spectrum of markets including
refractories, ceramics, abrasives, chemicals processing and other specialty
applications.

Primary Metals--This segment consists of Alcoa's worldwide smelter system.
Primary Metals receives alumina primarily from the Alumina and Chemicals
segment and produces aluminum ingot to be used by Alcoa's fabricating
businesses, as well as sold to external customers, aluminum traders and
commodity markets. Results from the sale of aluminum powder, scrap and excess
power are also included in this segment, as well as the results of aluminum
derivative contracts.

Flat-Rolled Products--This segment's principal business is the production and
sale of aluminum plate, sheet and foil. This segment includes rigid container
sheet, which is sold directly to customers in the packaging and consumer market
and is used to produce aluminum beverage cans. This segment also includes sheet
and plate used in transportation and distributor markets, of which
approximately two-thirds is sold directly to customers while the remainder is
sold through distributors.

Engineered Products--This segment includes hard- and soft-alloy extrusions,
including architectural extrusions, super-alloy castings, steel and aluminum
fasteners, aluminum forgings and wheels. These products serve the
transportation, building and construction and distributor markets and are sold
directly to customers and through distributors.

Packaging and Consumer--This segment includes foodservice, flexible packaging,
consumer products and packaging graphics design, as well as closures, PET
(polyethylene terephthalate) bottles and packaging machinery. The principal
products in this segment include aluminum foil; plastic wraps and bags; metal
and plastic beverage and food closures; pre-press services; and plastic shrink
film and wraps. Consumer products are marketed under brands including Reynolds
Wrap, Diamond(R), Baco and Cut-Rite(R) wax paper. Products are sold directly to
customers, consisting of various retail chains and commercial foodservice
distributors.

Other--This group includes other Alcoa businesses that are not included in the
segments previously mentioned. This group includes Alcoa Fujikura Ltd., which
produces fiber-optic cable, provides services to the telecommunications
industry and produces electrical components for the automotive industry;
residential building products operations, Alcoa Building Products; automotive
parts businesses; Thiokol, a producer of solid rocket propulsion systems
(Thiokol was sold in April 2001); and Reynolds Metals Company's metal
distribution business, RASCO (in November 2001, the net assets of RASCO were
contributed to a joint venture, Integris Metals, Inc., in which Alcoa retains a
50% equity interest). Products in this segment are generally sold directly to
customers or through distributors.

Alcoa's principal executive offices are located at 201 Isabella Street,
Pittsburgh, Pennsylvania 15212-5858 (telephone: (412) 553-4545).

                                      S-6



Recent Developments

On August 7, 2002, Moody's Investors Service announced in a corrected press
release that it had downgraded the long-term debt ratings of Alcoa from A1 to
A2 and its rated subsidiaries from A2 to A3. Alcoa's Prime-1 short-term rating
was not affected at this time.

In July 2002, Standard and Poor's Rating Services reaffirmed Alcoa's long-term
debt rating of A+ and its short-term debt rating of A-1.

                                      S-7



                                CAPITALIZATION

The following table sets forth the consolidated capitalization of Alcoa at June
30, 2002. The table should be read in conjunction with Alcoa's historical
consolidated financial statements and the notes thereto included or
incorporated by reference in this prospectus supplement. Except as reflected
herein, as of the date of this prospectus supplement, there has been no
material change to Alcoa's capitalization since June 30, 2002.



                                                                                           June 30,
                                                                                            2002
                                                                                        -------------
                                                                                        (in millions)
                                                                                         (unaudited)
                                                                                     
Cash, cash equivalents & short-term investments........................................    $   451
                                                                                           =======
Total assets...........................................................................    $28,897
                                                                                           =======
Short-term debt........................................................................    $    54
Long-term debt:
   Current portion of long-term debt...................................................        133
   Noncurrent portion of long-term debt................................................      7,120
                                                                                           =======
       Total debt......................................................................      7,307
                                                                                           =======
Minority interests.....................................................................    $ 1,331
                                                                                           =======
Shareholders' equity:
   Preferred stock, $100 par value; 557,740 shares authorized; 557,649 shares issued...    $    55
   Common stock, $1.00 par value; 1.8 billion shares authorized; 844,427,046 shares
     outstanding.......................................................................        925
   Additional capital..................................................................      6,094
   Retained earnings...................................................................      7,712
   Treasury stock, at cost.............................................................     (2,838)
   Accumulated other comprehensive loss................................................     (1,065)
                                                                                           =======
       Total shareholders' equity......................................................    $10,883
                                                                                           =======
Total capitalization...................................................................    $19,521
Total debt/capitalization..............................................................       37.4%
Noncurrent portion of long-term debt/Long-term capitalization..........................       36.7%


                      RATIOS OF EARNINGS TO FIXED CHARGES

The following table sets forth the ratio of Alcoa's earnings to fixed charges
for the periods indicated:



                   Six Months Ended
                       June 30,     Year Ended December 31,
                   ---------------- ------------------------
                         2002       2001 2000 1999 1998 1997
                         ----       ---- ---- ---- ---- ----
                                         
                         4.9        4.5  6.5  8.1  7.0  9.2


The ratios include all earnings, before extraordinary items and the cumulative
effects of accounting changes, and fixed charges of Alcoa and its majority
owned subsidiaries. Earnings have been calculated by adding to net income the
provision for taxes on income, amortization of capitalized interest, interest
expense and an amount representative of the interest factor in rentals, and the
distributed income of less than 50% owned entities, and have been decreased by
the undistributed earnings of entities less than 50% owned, preferred stock
dividend requirements of majority owned subsidiaries and the minority interest
share in the losses of majority owned subsidiaries without fixed charges of
Alcoa. Fixed charges consist of total interest expense, amortization of debt
expense, an amount representative of the interest factor in rentals,
capitalized interest and preferred stock dividend requirements of majority
owned subsidiaries.

                                      S-8



                                USE OF PROCEEDS

The net proceeds of the offering are estimated to be $1,387,834,700, after
deducting underwriting discounts and our estimated offering expenses. Alcoa
intends to use the net proceeds of the offering to refinance outstanding
commercial paper and other short-term debt and for general corporate purposes.
This indebtedness has a weighted average interest rate of approximately 1.78%
and it typically has a weighted average maturity of less than 60 days. In
addition, we are frequently engaged in the evaluation of, and discussions with,
potential acquisition candidates. Pending any specific application, we may
initially invest funds in short-term marketable securities. Following repayment
of such indebtedness, we expect to incur additional indebtedness under our
commercial paper program or otherwise in the ordinary course of business.

                                      S-9



                       DIRECTORS AND EXECUTIVE OFFICERS

The following table sets forth the name and present principal occupation or
employment of each director and executive officer (as designated by the Board
of Directors) of Alcoa. The business address of each such person is Alcoa
Corporate Center, 201 Isabella Street, Pittsburgh, Pennsylvania 15212-5858.



                                              Present Principal Occupation
Name                                                 or Employment
----                                          ----------------------------
                    
Directors

Alain J. P. Belda      Chairman of the Board and Chief Executive Officer, Alcoa Inc.

Kathryn S. Fuller      President, World Wildlife Fund

Carlos Ghosn           President and Chief Executive Officer, Nissan Motor Co., Ltd.

Joseph T. Gorman       Former Chairman, TRW Inc.

Judith M. Gueron       President, Manpower Demonstration Research Corporation

Sir Ronald Hampel      Chairman, United Business Media

John P. Mulroney       Executive Director, Opera Company of Philadelphia

Henry B. Schacht       Chairman, Lucent Technologies Inc.

Franklin A. Thomas     Consultant, TFF Study Group

Ernesto Zedillo        Director, Yale Center for the Study of Globalization


Executive Officers

Alain J. P. Belda      Director, Chairman of the Board and Chief Executive Officer

Ricardo E. Belda       Executive Vice President--Alcoa and Group President, Alcoa Europe

L. Patrick Hassey      Executive Vice President--Alcoa and Group President, Alcoa Industrial
                       Components

Robert S. Hughes, II   Executive Vice President--Alcoa and Group President, Alcoa Allied Products

Richard B. Kelson      Executive Vice President and Chief Financial Officer

William E. Leahey, Jr. Executive Vice President--Alcoa and Group President, Packaging, Consumer,
                       Construction and Distribution

Timothy S. Mock        Vice President, Alcoa Business Support Services and Controller

G. John Pizzey         Executive Vice President--Alcoa and Group President, Alcoa Primary
                       Products

Lawrence R. Purtell    Executive Vice President and General Counsel



                                     S-10



                      SELECTED HISTORICAL FINANCIAL DATA

The selected historical financial data of Alcoa set forth below have been
derived from the historical consolidated financial statements of Alcoa as they
appeared in Alcoa's Annual Report on Form 10-K filed with the SEC for the year
ended December 31, 2001, and Alcoa's Quarterly Report on Form 10-Q filed with
the SEC for the period ended June 30, 2002. See Note A to the selected
historical financial data below for the transitional disclosures required under
SFAS No. 142, which was adopted by Alcoa effective January 1, 2002. Results for
the six months ended June 30, 2002 are not necessarily indicative of the
results that may be expected for the entire year.



                                                                       At or for the Six
                                                                         Months ended           At or for the Year ended
                                                                           June 30,                   December 31,
                                                                      ----------------------  -------------------------------
                                                                        2002        2001        2001       2000       1999
                                                                       --------    --------   --------   --------   --------
                                                                          (unaudited)
                                                                      (dollars in millions, except per-share amounts and ingot
                                                                                           prices)
                                                                                                     
Operating Results
Sales................................................................ $ 10,228    $ 12,167    $ 22,859   $ 22,936   $ 16,323
Cost of goods sold...................................................    8,240       9,320      17,857     17,342     12,536
Selling, general administrative and other expenses...................      555         649       1,276      1,108        851
Research and development expenses....................................      103         104         203        194        128
Depreciation, depletion and amortization.............................      530         630       1,253      1,207        888
Special items........................................................       --         212         566         --         --
Interest expense.....................................................      158         208         371        427        195
Other (income), net..................................................      (89)       (199)       (308)      (154)      (124)
Provision for taxes on income........................................      227         404         525        942        553
Income from operations...............................................      504         839       1,116      1,870      1,296
Minority interests...................................................      (88)       (128)       (208)      (381)      (242)
Accounting changes...................................................       34          --          --         (5)        --
Net income (Note A)..................................................      450         711         908      1,484      1,054
------------------------------------------------------------------------------------------------------------------------------
  Alcoa's average realized price per pound for aluminum ingot........      .66         .75         .72        .77        .67
  LME average 3-month price per pound for aluminum ingot.............      .63         .70         .66        .71        .63
------------------------------------------------------------------------------------------------------------------------------
Dividends Declared
Preferred stock......................................................        1           1           2          2          2
Common stock.........................................................      254         303         516        416        296
------------------------------------------------------------------------------------------------------------------------------
Financial Position
  Working capital....................................................    2,311       2,629       1,789       (376)     1,797
  Properties, plants and equipment, net..............................   12,198      11,995      11,982     12,850      9,133
  Other assets (liabilities), net....................................    4,825       3,646       4,544      5,449       (497)
  Total assets.......................................................   28,897      28,423      28,355     31,691     17,066
  Long-term debt (noncurrent)........................................    7,120       5,977       6,388      4,987      2,657
  Minority interests.................................................    1,331       1,251       1,313      1,514      1,458
  Shareholders' equity...............................................   10,883      11,042      10,614     11,422      6,318
------------------------------------------------------------------------------------------------------------------------------
Common Share Data
(dollars per share)
Basic earnings per share (after cumulative effect)...................      .53         .82        1.06       1.82       1.43
Diluted earnings per share (after cumulative effect).................      .53         .81        1.05       1.80       1.41
Dividends declared...................................................      .30         .30        .600       .500       .403
Book value (based on shares outstanding).............................    12.82       12.80       12.46      13.13       8.51
Price range: High....................................................    39.75       45.71       45.71      43.63      41.69
Low..................................................................    30.17       30.63       27.36      23.13      17.97
Shareholders (number)................................................     N.A.        N.A.     266,800    265,300    185,000
Average shares outstanding (thousands)...............................  846,352     863,462     857,990    814,229    733,888
------------------------------------------------------------------------------------------------------------------------------
Operating Data
(thousands of metric tons)
Alumina shipments....................................................    3,621       3,761       7,217      7,472      7,054
Aluminum product shipments:
  Primary............................................................      904         912       1,776      2,032      1,411
  Fabricated and finished products...................................    1,688       1,700       3,218      3,366      3,067
    Total............................................................    2,592       2,612       4,994      5,398      4,478
Primary aluminum capacity:
   Consolidated......................................................    4,144       4,195       4,165      4,219      3,182
   Total, including affiliates' and others' share of joint ventures..    5,048       5,099       5,069      5,141      4,024
Primary aluminum production:
   Consolidated......................................................    1,719       1,808       3,488      3,539      2,851
   Total, including affiliates' and others' share of joint ventures..    2,106       2,208       4,257      4,395      3,695
------------------------------------------------------------------------------------------------------------------------------
Other Statistics
Capital expenditures................................................. $    571    $    496    $  1,177   $  1,121   $    920
Number of employees..................................................  129,000     142,000     129,000    142,000    107,700
Pretax profit on sales (%)...........................................      7.1        10.2         7.2       12.3       11.3
Return on average shareholders' equity (%)...........................      8.0        13.1         8.3       16.8       17.2
Return on average invested capital (%)...............................      6.6        11.0         7.5       15.0       13.8
------------------------------------------------------------------------------------------------------------------------------


                                     S-11



Note A:

Alcoa adopted Statement of Financial Accounting Standards (SFAS) No. 141,
"Business Combinations" which requires that the purchase method of accounting
be applied to all business combinations after June 30, 2001. SFAS No. 141 also
established criteria for recognition of intangible assets and goodwill.
Effective January 1, 2002, Alcoa adopted SFAS No. 142 "Goodwill and Other
Intangible Assets." Under this standard, goodwill and intangibles with
indefinite useful lives are no longer amortized. This standard also requires,
at a minimum, an annual assessment of the carrying value of goodwill and
intangibles with indefinite useful lives. If the carrying value of goodwill or
an intangible asset exceeds its fair value, an impairment loss shall be
recognized. A discounted cash flow model was used to determine the fair value
of Alcoa's businesses for purposes of testing goodwill for impairment. The
discount rate used was based on a risk-adjusted weighted average cost of
capital for each business.

The cumulative effect adjustment recognized on January 1, 2002 upon adoption of
these new standards was $34 (after tax), consisting of income from the
write-off of negative goodwill from prior acquisitions of $49, offset by a $15
write-off for the impairment of goodwill in the automotive business resulting
from a change in the criteria for the measurement of impairments from an
undiscounted to a discounted cash flow method.

The effects of adopting the new standards on net income and diluted earnings
per share for the six-month period ended June 30, 2001 and for the years ended
December 31, 2001, 2000 and 1999, follow.



                                           For the six   For the year ended
                                           months ended     December 31,
                                           ------------ --------------------
                                             June 30,
                                           ------------
                                               2001      2001   2000   1999
                                           ------------ ------ ------ ------
                                                          
    Net income............................     $711     $  908 $1,484 $1,054
    Add: goodwill amortization............       87        171    125     40
                                               ----     ------ ------ ------
    Income excluding goodwill amortization     $798     $1,079 $1,609 $1,094

    Diluted earnings per share:
    Net income............................     $.81     $ 1.05 $ 1.80 $ 1.41
    Add: goodwill amortization............      .10        .20    .15    .05
                                               ----     ------ ------ ------
    Income excluding goodwill amortization     $.91     $ 1.25 $ 1.95 $ 1.46



                                     S-12



                           DESCRIPTION OF THE NOTES

The following description of the particular terms of the notes offered hereby
supplements the description of the general terms and provisions of the debt
securities set forth under "Description of Senior Debt Securities" beginning on
page 8 in the accompanying prospectus. This description replaces the
description of the notes in the accompanying prospectus, to the extent of any
inconsistency. Terms used in this prospectus supplement that are otherwise not
defined will have the meanings given to them in the accompanying prospectus.

General

The 2007 Notes will be issued in an initial aggregate principal amount of
$800,000,000, will bear interest from August 13, 2002, at the rate of interest
stated on the cover page of this prospectus supplement, will mature, at par, on
August 15, 2007 and will be offered and sold in denominations of $1,000 and any
integral multiple thereof.

Interest on the 2007 Notes will be payable semi-annually on February 15 and
August 15, commencing February 15, 2003, to the persons in whose names the 2007
Notes are registered at the close of business on the February 1 or August 1, as
the case may be, next preceding such interest payment date.

The 2013 Notes will be issued in an initial aggregate principal amount of
$600,000,000, will bear interest from August 13, 2002, at the rate of interest
stated on the cover page of this prospectus supplement, will mature, at par, on
January 15, 2013 and will be offered and sold in denominations of $1,000 and
any integral multiple thereof.

Interest on the 2013 Notes will be payable semi-annually on January 15 and July
15, commencing January 15, 2003, to the persons in whose names the 2013 Notes
are registered at the close of business on the January 1 or July 1, as the case
may be, next preceding such interest payment date.

Interest on the notes will be paid on the basis of a 360-day year consisting of
twelve 30-day months.

The notes will be issued under the indenture, dated as of September 30, 1993,
between Alcoa and J.P. Morgan Trust Company, N.A. (formerly known as Chase
Manhattan Trust Company, N.A.), as successor trustee, relating to the senior
debt securities described in the accompanying prospectus.

The notes are not subject to the provisions of any optional or mandatory
sinking fund. The notes are not convertible or exchangeable into any other
security of Alcoa. The indenture sets forth the conditions under which Alcoa
may enter into a merger or consolidation, or convey, transfer or lease all or
substantially all of its assets or properties (see "Description of Senior Debt
Securities--Consolidation, Merger and Sale of Assets" in the prospectus). The
covenants contained in the indenture and the notes will not afford holders
protection in the event of a sudden decline in credit rating that may result
from a recapitalization, restructuring or other highly leveraged transaction.

Optional Redemption

The notes will be redeemable, as a whole or in part, at our option, at any time
or from time to time, on at least 30 days, but not more than 60 days, prior
notice to holders of the notes given in accordance with "--Notices" below, at a
redemption price equal to the greater of:

..  100% of the principal amount of the notes to be redeemed, plus accrued
   interest, if any, to the redemption date; or

..  the sum of the present values of the Remaining Scheduled Payments, as
   defined below, discounted, on a semiannual basis, assuming a 360-day year
   consisting of twelve 30-day months, at the Treasury Rate, as defined below,
   plus 10 basis points in the case of the 2007 Notes and 20 basis points in
   the case of the 2013 Notes, plus, in either case, accrued interest to the
   date of redemption which has not been paid.

"Treasury Rate" means, with respect to any redemption date for the notes:

..  the yield, under the heading which represents the average for the
   immediately preceding week, appearing in the most recently published
   statistical release designated "H.15(519)" or any successor publication
   which is

                                     S-13



  published weekly by the Board of Governors of the Federal Reserve System and
  which establishes yields on actively traded United States Treasury securities
  adjusted to constant maturity under the caption "Treasury Constant
  Maturities," for the maturity corresponding to the Comparable Treasury Issue;
  provided that if no maturity is within three months before or after the
  maturity date for the notes, yields for the two published maturities most
  closely corresponding to the Comparable Treasury Issue will be determined and
  the Treasury Rate will be interpolated or extrapolated from those yields on a
  straight line basis rounding to the nearest month; or

..  if that release, or any successor release, is not published during the week
   preceding the calculation date or does not contain such yields, the rate per
   annum equal to the semiannual equivalent yield to maturity of the Comparable
   Treasury Issue, calculated using a price for the Comparable Treasury Issue
   (expressed as a percentage of its principal amount) equal to the Comparable
   Treasury Price for that redemption date.

The Treasury Rate will be calculated on the third business day preceding the
redemption date.

"Comparable Treasury Issue" means the United States Treasury security selected
by an Independent Investment Banker as having a maturity comparable to the
remaining term of the notes to be redeemed that would be utilized, at the time
of selection and in accordance with customary financial practice, in pricing
new issues of corporate debt securities of comparable maturity to the remaining
term of such notes.

"Independent Investment Banker" means one of the Reference Treasury Dealers, to
be appointed by Alcoa.

"Comparable Treasury Price" means, with respect to any redemption date for the
notes:

..  the average of four Reference Treasury Dealer Quotations for that redemption
   date, after excluding the highest and lowest of such Reference Treasury
   Dealer Quotations; or

..  if the trustee obtains fewer than four Reference Treasury Dealer Quotations,
   the average of all quotations obtained by the trustee.

"Reference Treasury Dealer Quotations" means, with respect to each Reference
Treasury Dealer and any redemption date, the average, as determined by the
trustee, of the bid and asked prices for the Comparable Treasury Issue,
expressed in each case as a percentage of its principal amount, quoted in
writing to the trustee by such Reference Treasury Dealer at 3:30 p.m., New York
City time on the third business day preceding such redemption date.

"Reference Treasury Dealer" means each of Credit Suisse First Boston
Corporation, Morgan Stanley & Co. Incorporated, and two other treasury dealers
selected by Alcoa, and their respective successors; provided, however, that if
any of the foregoing shall cease to be a primary U.S. Government securities
dealer, which we refer to as a "Primary Treasury Dealer," Alcoa will substitute
therefor another nationally recognized investment banking firm that is a
Primary Treasury Dealer.

"Remaining Scheduled Payments" means, with respect to each note to be redeemed,
the remaining scheduled payments of the principal thereof and interest thereon
that would be due after the related redemption date but for such redemption;
provided, however, that, if such redemption date is not an interest payment
date with respect to such note, the amount of the next succeeding scheduled
interest payment thereon will be deemed to be reduced by the amount of interest
accrued thereon to such redemption date.

On and after the redemption date, interest will cease to accrue on the notes or
any portion thereof called for redemption, unless Alcoa defaults in the payment
of the redemption price and accrued interest. On or before the redemption date,
Alcoa will deposit with a paying agent, or the trustee, money sufficient to pay
the redemption price of and accrued interest on the notes to be redeemed on
such date. If less than all of the notes are to be redeemed, the notes to be
redeemed shall be selected by the trustee by such method as the trustee shall
deem fair and appropriate.

Status

The notes will rank pari passu with other unsecured unsubordinated indebtedness
of Alcoa.

                                     S-14



Defeasance of Certain Obligations

Alcoa may omit to comply with the covenants described under "Description of
Senior Debt Securities--Certain Limitations" and the covenants described under
"Description of Senior Debt Securities--Consolidation, Merger and Sale of
Assets" in the prospectus if the conditions set forth under "Description of
Senior Debt Securities--Defeasance and Covenant Defeasance" in the prospectus
are satisfied.

Book-Entry, Delivery and Form

The notes will be issued in the form of one or more fully registered global
notes, which we refer to as the "Global Notes," which will be deposited with,
or on behalf of, The Depository Trust Company, New York, New York, which we
refer to as the "Depositary" or "DTC," and registered in the name of Cede &
Co., the Depositary's nominee. Beneficial interests in the Global Notes will be
represented through book-entry accounts of financial institutions acting on
behalf of beneficial owners as direct and indirect participants in the
Depositary. Investors may elect to hold interests in the Global Notes through
the Depositary, Clearstream Banking, Societe Anonyme, which we refer to as
"Clearstream, Luxembourg," or Euroclear Bank S.A./N.V., as operator of the
Euroclear System, which we refer to as "Euroclear," if they are participants in
such systems, or indirectly through organizations which are participants in
such systems. Clearstream, Luxembourg and Euroclear will hold interests on
behalf of their participants through customers' securities accounts in
Clearstream, Luxembourg's and Euroclear's names on the books of their
respective depositaries, which in turn will hold such interests in customers'
securities accounts in the depositaries' names on the books of the Depositary.
Citibank, N.A. will act as depositary for Clearstream, Luxembourg and The Chase
Manhattan Bank will act as depositary for Euroclear, which we refer to in such
capacities as the "U.S. Depositaries." Except as set forth below, the Global
Notes may be transferred, in whole and not in part, only to another nominee of
the Depositary or to a successor of the Depositary or its nominee.

The Depositary has advised Alcoa as follows: the Depositary is a
limited-purpose trust company organized under the New York Banking Law, a
"banking organization" within the meaning of the New York Banking Law, a member
of the Federal Reserve System, a "clearing corporation" within the meaning of
the New York Uniform Commercial Code, and a "clearing agency" registered
pursuant to the provisions of Section 17A of the Securities Exchange Act of
1934. The Depositary holds securities deposited with it by its participants and
facilitates the settlement of transactions among its participants in such
securities through electronic computerized book-entry changes in accounts of
the participants, thereby eliminating the need for physical movement of
securities certificates. The Depositary's participants include securities
brokers and dealers, including the underwriters, banks, trust companies,
clearing corporations and certain other organizations, some of whom, and/or
their representatives, own the Depositary. Access to the Depositary's
book-entry system is also available to others, such as banks, brokers, dealers
and trust companies that clear through or maintain a custodial relationship
with a participant, either directly or indirectly.

Clearstream, Luxembourg advises that it is incorporated under the laws of
Luxembourg as a bank. Clearstream, Luxembourg holds securities for its
customers, which we refer to as "Clearstream, Luxembourg Customers," and
facilitates the clearance and settlement of securities transactions between
Clearstream, Luxembourg Customers through electronic book-entry transfers
between their accounts. Clearstream, Luxembourg provides to Clearstream,
Luxembourg Customers, among other things, services for safekeeping,
administration, clearance and settlement of internationally traded securities
and securities lending and borrowing. Clearstream, Luxembourg interfaces with
domestic securities markets in over 30 countries through established depository
and custodial relationships. As a bank, Clearstream, Luxembourg is subject to
regulation by the Luxembourg Commission for the Supervision of the Financial
Sector, also known as the Commission de Surveillance du Secteur Financier.
Clearstream, Luxembourg Customers are recognized financial institutions around
the world, including underwriters, securities brokers and dealers, banks, trust
companies, clearing corporations and certain other organizations. Clearstream,
Luxembourg's Customers in the United States are limited to securities brokers
and dealers and banks. Indirect access to Clearstream, Luxembourg is also
available to other institutions such as banks, brokers, dealers and trust
companies that clear through or maintain a custodial relationship with a
Clearstream, Luxembourg Customer.

Distributions with respect to the notes held through Clearstream, Luxembourg
will be credited to cash accounts of Clearstream, Luxembourg Customers in
accordance with its rules and procedures, to the extent received by the U.S.
Depositary for Clearstream, Luxembourg.

                                     S-15



Euroclear advises that it was created in 1968 to hold securities for its
participants, which we refer to as "Euroclear Participants," and to clear and
settle transactions between Euroclear Participants through simultaneous
electronic book-entry delivery against payment, thereby eliminating the need
for physical movement of certificates and any risk from lack of simultaneous
transfers of securities and cash. Euroclear provides various other services,
including securities lending and borrowing and interfaces with domestic markets
in several countries. Euroclear is operated by Euroclear Bank S.A./N.V., which
we refer to as the "Euroclear Operator," under contract with Euroclear
Clearance Systems, S.C., a Belgian cooperative corporation, which we refer to
as the "Cooperative." All operations are conducted by the Euroclear Operator,
and all Euroclear securities clearance accounts and Euroclear cash accounts are
accounts with the Euroclear Operator, not the Cooperative. The Cooperative
establishes policy for Euroclear on behalf of Euroclear Participants. Euroclear
Participants include banks, including central banks, securities brokers and
dealers and other professional financial intermediaries and may include the
underwriters. Indirect access to Euroclear is also available to other firms
that clear through or maintain a custodial relationship with a Euroclear
Participant, either directly or indirectly.

Securities clearance accounts and cash accounts with the Euroclear Operator are
governed by the Terms and Conditions Governing Use of Euroclear and the related
Operating Procedures of the Euroclear System, and applicable Belgian law, which
we refer to collectively as the "Terms and Conditions." The Terms and
Conditions govern transfers of securities and cash within Euroclear,
withdrawals of securities and cash from Euroclear, and receipts of payments
with respect to securities in Euroclear. All securities in Euroclear are held
on a fungible basis without attribution of specific certificates to specific
securities clearance accounts. The Euroclear Operator acts under the Terms and
Conditions only on behalf of Euroclear Participants and has no record of or
relationship with persons holding through Euroclear Participants.

Distributions with respect to the notes held beneficially through Euroclear
will be credited to the cash accounts of Euroclear Participants in accordance
with the Terms and Conditions, to the extent received by the U.S. Depositary
for Euroclear.

Euroclear further advises that investors that acquire, hold and transfer
interests in the notes by book-entry through accounts with the Euroclear
Operator or any other securities intermediary are subject to the laws and
contractual provisions governing their relationship with their intermediary, as
well as the laws and contractual provisions governing the relationship between
such an intermediary and each other intermediary, if any, standing between
themselves and the Global Notes.

The Euroclear Operator advises that under Belgian law, investors that are
credited with securities on the records of the Euroclear Operator have a
co-property right in the fungible pool of interests in securities on deposit
with the Euroclear Operator in an amount equal to the amount of interests in
securities credited to their accounts. In the event of the insolvency of the
Euroclear Operator, Euroclear Participants would have a right under Belgian law
to the return of the amount and type of interests in securities credited to
their accounts with the Euroclear Operator. If the Euroclear Operator did not
have a sufficient amount of interests in securities on deposit of a particular
type to cover the claims of all Euroclear Participants credited with such
interests in securities on the Euroclear Operator's records, all Participants
having an amount of interests in securities of such type credited to their
accounts with the Euroclear Operator would have the right under Belgian law to
the return of their pro rata share of the amount of interest in securities
actually on deposit.

Under Belgian law, the Euroclear Operator is required to pass on the benefits
of ownership in any interests in securities on deposit with it, such as
dividends, voting rights and other entitlements, to any person credited with
such interests in securities on its records.

Individual certificates in respect of the notes will not be issued in exchange
for the Global Notes, except in very limited circumstances. If DTC notifies us
that it is unwilling or unable to continue as a clearing system in connection
with the Global Notes or ceases to be a clearing agency registered under the
Securities Exchange Act of 1934, and a successor clearing system is not
appointed by us within 90 days after receiving such notice from DTC or upon
becoming aware that DTC is no longer so registered, we will issue or cause to
be issued individual certificates in registered form on registration of
transfer of, or in exchange for, book-entry interests in the notes represented
by such Global Notes upon delivery of such Global Notes for cancellation. In
the event that individual certificates are issued, holders of the notes will be
able to receive payments, including principal and interest, on the notes and
effect transfer of the notes at the offices of our paying and transfer agent in
Luxembourg, Deutsche Bank Luxembourg.

                                     S-16



Title to book-entry interests in the notes will pass by book-entry registration
of the transfer within the records of Clearstream, Luxembourg, Euroclear or
DTC, as the case may be, in accordance with their respective procedures.
Book-entry interests in the notes may be transferred within Clearstream,
Luxembourg and within Euroclear and between Clearstream, Luxembourg and
Euroclear in accordance with procedures established for these purposes by
Clearstream, Luxembourg and Euroclear. Book-entry interests in the notes may be
transferred within DTC in accordance with procedures established for this
purpose by DTC. Transfers of book-entry interests in the notes among
Clearstream, Luxembourg and Euroclear and DTC may be effected in accordance
with procedures established for this purpose by Clearstream, Luxembourg,
Euroclear and DTC.

A further description of the Depositary's procedures with respect to the Global
Notes is set forth in the accompanying prospectus under "Description of Senior
Debt Securities--Book-Entry Securities" beginning on page 12. The Depositary
has confirmed to us, the underwriters and the trustee that it intends to follow
such procedures.

Global Clearance and Settlement Procedures

Initial settlement for the notes will be made in immediately available funds.
Secondary market trading between DTC participants will occur in the ordinary
way in accordance with the Depositary's rules and will be settled in
immediately available funds using the Depositary's Same-Day Funds Settlement
System. Secondary market trading between Clearstream, Luxembourg Customers
and/or Euroclear Participants will occur in the ordinary way in accordance with
the applicable rules and operating procedures of Clearstream, Luxembourg and
Euroclear and will be settled using the procedures applicable to conventional
Eurobonds in immediately available funds.

Cross-market transfers between persons holding directly or indirectly through
the Depositary on the one hand, and directly or indirectly through Clearstream,
Luxembourg Customers or Euroclear Participants, on the other, will be effected
in the Depositary in accordance with the Depositary's rules on behalf of the
relevant European international clearing system by its U.S. Depositary;
however, such cross-market transactions will require delivery of instructions
to the relevant European international clearing system by the counterparty in
such system in accordance with its rules and procedures and within its
established deadlines, in European time. The relevant European international
clearing system will, if the transaction meets its settlement requirements,
deliver instructions to its U.S. Depositary to take action to effect final
settlement on its behalf by delivering interests in the notes to or receiving
interests in the notes from the Depositary, and making or receiving payment in
accordance with normal procedures for same-day funds settlement applicable to
the Depositary. Clearstream, Luxembourg Customers and Euroclear Participants
may not deliver instructions directly to their respective U.S. Depositaries.

Because of time-zone differences, credits of interests in the notes received in
Clearstream, Luxembourg or Euroclear as a result of a transaction with a DTC
participant will be made during subsequent securities settlement processing and
dated the business day following the Depositary settlement date. Such credits
or any transactions involving interests in such notes settled during such
processing will be reported to the relevant Clearstream, Luxembourg Customers
or Euroclear Participants on such business day. Cash received in Clearstream,
Luxembourg or Euroclear as a result of sales of interests in the notes by or
through a Clearstream, Luxembourg Customer or a Euroclear Participant to a DTC
participant will be received with value on the Depositary settlement date but
will be available in the relevant Clearstream, Luxembourg or Euroclear cash
account only as of the business day following settlement in the Depositary.

Although the Depositary, Clearstream, Luxembourg and Euroclear have agreed to
the foregoing procedures in order to facilitate transfers of interests in the
notes among participants of the Depositary, Clearstream, Luxembourg and
Euroclear, they are under no obligation to perform or continue to perform such
procedures and such procedures may be changed or discontinued at any time.

Tax Redemption

The notes may be redeemed as a whole, at our option at any time before
maturity, upon the giving of a notice of redemption as described below, if:

(a) we determine that, as a result of any change in or amendment to the laws,
    or any regulations or rulings promulgated thereunder, of the United States
    or of any political subdivision or taxing authority thereof or

                                     S-17



   therein, or any change in official position regarding the application or
   interpretation of such laws, regulations or rulings, which change or
   amendment becomes effective on or after the date of this prospectus
   supplement, we have or will become obligated to pay additional amounts as
   described under "--Payment of Additional Amounts" below; or

(b) a taxing authority of the United States takes an action on or after the
    date of this prospectus supplement, whether or not with respect to us or
    any of our affiliates, that results in a substantial probability that we
    will or may be required to pay such additional amounts, in either case,
    with respect to such notes for reasons outside our control and after taking
    reasonable measures available to us to avoid such obligation.

The notes will be redeemed at a redemption price equal to 100% of the principal
amount thereof, together with accrued interest to the date fixed for
redemption. Before the giving of any notice of redemption under the
circumstances described above, we will deliver to the trustee:

..  a certificate stating that we are entitled to effect such redemption and
   setting forth a statement of facts showing that the conditions precedent to
   our right to so redeem have occurred; and

..  an opinion of independent counsel satisfactory to the trustee to the effect
   that we have or will become obligated or there is a substantial probability
   that we will or may be required to pay such additional amounts for the
   reasons described above;

provided that no such notice of redemption will be given earlier than 60 days
before the earliest date on which we would be obligated to pay such additional
amounts if a payment in respect of the notes were then due.

Notice of redemption will be given to holders of the notes not less than 30 nor
more than 60 days before the date fixed for redemption, which date and the
applicable redemption price will be specified in the notice. This notice will
be given in accordance with "--Notices" below.

Further Issues

We may from time to time, without notice to, or the consent of, the registered
holders of the notes, create and issue further notes equal in rank to the notes
offered hereby in all respects (or in all respects except for the payment of
interest accruing before the issue date of such further notes or except for the
first payment of interest following the issue date of such further notes) and
so that such further notes may be consolidated and form a single series with
the notes and have the same terms as to status, redemption or otherwise as the
notes. We will not issue any further notes intended to form a single series
with the notes unless the further notes will be fungible with all notes of the
same series for U.S. federal income tax purposes.

Payment of Additional Amounts

We will, subject to certain exceptions and limitations set forth below, pay
such additional amounts to the beneficial owner of any note who is a Non-U.S.
Holder, as defined below, as may be necessary in order that every net payment
of principal of and interest on such note and any other amounts payable on such
note, after withholding for or on account of any present or future tax,
assessment or governmental charge imposed upon or as a result of such payment
by the United States, or any political subdivision or taxing authority thereof
or therein, will not be less than the amount provided for in such note to be
then due and payable. We will not, however, be required to make any such
payment of additional amounts to any beneficial owner for or on account of:

..  any such tax, assessment or other governmental charge that would not have
   been so imposed or withheld but for the existence of any present or former
   connection between such beneficial owner (or between a fiduciary, settlor,
   beneficiary, member or shareholder of such beneficial owner, if such
   beneficial owner is an estate, a trust, a partnership or a corporation) and
   the United States and its possessions, including, without limitation, such
   beneficial owner (or such fiduciary, settlor, beneficiary, member or
   shareholder) being or having been a citizen or resident thereof or being or
   having been engaged in a trade or business or present therein or having, or
   having had, a permanent establishment therein;

..  any estate, inheritance, gift, sales, excise, transfer, wealth or personal
   property tax or any similar tax, assessment or governmental charge;

                                     S-18



..  any tax, assessment or other governmental charge imposed or withheld by
   reason of such beneficial owner's past or present status as a personal
   holding company or foreign personal holding company or controlled foreign
   corporation or passive foreign investment company with respect to the United
   States or as a corporation that accumulates earnings to avoid United States
   federal income tax;

..  any tax, assessment or other governmental charge that is payable otherwise
   than by withholding from payments on or in respect of any note;

..  any tax, assessment or other governmental charge that would not have been
   imposed or withheld but for the failure to comply with certification,
   information or other reporting requirements concerning the nationality,
   residence or identity of the beneficial owner of such note, if such
   compliance is required by statute or by regulation of the United States or
   of any political subdivision or taxing authority thereof or therein or by an
   applicable income tax treaty to which the United States is a party as a
   precondition to relief or exemption from such tax, assessment or other
   governmental charge;

..  any tax, assessment or other governmental charge imposed or withheld by
   reason of such beneficial owner's past or present status as the actual or
   constructive owner of 10% or more of the total combined voting power of all
   classes of our stock entitled to vote or as a controlled foreign corporation
   that is related directly or indirectly to us through stock ownership or
   being a bank making a loan in the ordinary course of business;

..  any withholding or deduction imposed on a payment to an individual that is
   required to be made pursuant to any European Union Directive on the taxation
   of savings implementing the conclusions of the ECOFIN Council meeting of
   November 26-27, 2000, or any law implementing or complying with, or
   introduced in order to conform to, such Directive; or

..  any combination of these factors.

Such additional amounts shall also not be paid with respect to any payment on a
note to a Non-U.S. Holder, as defined below, who is a fiduciary or partnership
or other than the sole beneficial owner of such payment to the extent such
payment would be required by the laws of the United States, or any political
subdivision thereof, to be included in the income, for tax purposes, of a
beneficiary or settlor with respect to such fiduciary or a member of such
partnership or a beneficial owner who would not have been entitled to such
additional amounts had such beneficiary, settlor, member or beneficial owner,
as the case may be, held its interest in the note directly. The term "Non-U.S.
Holder" is defined below and includes a foreign partnership to the extent that
one or more of its members is a foreign corporation, a nonresident alien
individual or a nonresident alien fiduciary of a foreign estate or trust.

Notices

Notices to holders of the notes will be sent by mail to the registered holders
and will be published, whether the notes are in global or definitive form, so
long as the notes are listed on the Luxembourg Stock Exchange, in a daily
newspaper of general circulation in Luxembourg. It is expected that publication
will be made in Luxembourg in the Luxemburger Wort. Any such notice shall be
deemed to have been given on the date of such publication or, if published more
than once, on the date of the first such publication. So long as the notes are
listed on the Luxembourg Stock Exchange, any appointment of or change in the
Luxembourg paying agent and transfer agent will be published in Luxembourg in
the manner set forth above.

                                     S-19



                            UNITED STATES TAXATION

General

This section summarizes the material U.S. tax consequences to holders of notes.
However, the discussion is limited in the following ways:

..  The discussion only covers you if you buy your notes in the initial offering.

..  The discussion only covers you if you hold your notes as a capital asset
   (that is, for investment purposes), and if you do not have a special tax
   status.

..  The discussion does not cover tax consequences that depend upon your
   particular tax situation in addition to your ownership of notes. We suggest
   that you consult your tax advisor about the consequences of holding notes in
   your particular situation.

..  The discussion is based on current law. Changes in the law may change the
   tax treatment of the notes.

..  The discussion does not cover state, local or foreign law.

..  The discussion does not apply to you if you are a non-U.S. holder of notes
   and if you (a) own 10% or more of the voting stock of Alcoa, (b) are a
   "controlled foreign corporation" with respect to Alcoa, or (c) are a bank
   making a loan in the ordinary course of its business.

..  We have not requested a ruling from the IRS on the tax consequences of
   owning the notes. As a result, the IRS could disagree with portions of this
   discussion.

If you are considering buying notes, we suggest that you consult your tax
advisors about the tax consequences of holding the notes in your particular
situation.

Tax Consequences to U.S. Holders

This section applies to you if you are a "U.S. Holder". A "U.S. Holder" is:

..  an individual U.S. citizen or resident alien;

..  a corporation, or entity taxable as a corporation, that was created under
   U.S. law (federal or state); or

..  an estate or trust whose worldwide income is subject to U.S. federal income
   tax.

If a partnership holds notes, the tax treatment of a partner will generally
depend upon the status of the partner and upon the activities of the
partnership. If you are a partner of a partnership holding notes, we suggest
that you consult your tax advisor.

Interest

..  If you are a cash method taxpayer (including most individual holders), you
   must report interest on the notes in your income when you receive it.

..  If you are an accrual method taxpayer, you must report interest on the notes
   in your income as it accrues.

Sale or Retirement of Notes

On your sale or retirement of your note:

..  You will have taxable gain or loss equal to the difference between the
   amount received by you and your tax basis in the note. Your tax basis in the
   note is your cost, subject to certain adjustments.

..  Your gain or loss will generally be capital gain or loss, and will be long
   term capital gain or loss if you held the note for more than one year.

..  If you sell the note between interest payment dates, a portion of the amount
   you receive reflects interest that has accrued on the note but has not yet
   been paid by the sale date. That amount is treated as ordinary interest
   income and not as sale proceeds.

                                     S-20



Information Reporting and Backup Withholding

Under the tax rules concerning information reporting to the IRS:

..  Assuming you hold your notes through a broker or other securities
   intermediary, the intermediary must provide information to the IRS
   concerning interest and retirement proceeds on your notes, unless an
   exemption applies.

..  Similarly, unless an exemption applies, you must provide the intermediary
   with your Taxpayer Identification Number for its use in reporting
   information to the IRS. If you are an individual, this is your social
   security number. You are also required to comply with other IRS requirements
   concerning information reporting.

..  If you are subject to these requirements but do not comply, the intermediary
   must withhold up to 31% of all amounts payable to you on the notes
   (including principal payments). If the intermediary withholds payments, you
   may use the withheld amount as a credit against your federal income tax
   liability.

..  All individuals are subject to these requirements. Some holders, including
   all corporations, tax-exempt organizations and individual retirement
   accounts, are exempt from these requirements.

Tax Consequences to Non-U.S. Holders

For purposes of the following discussion a "Non-U.S. Holder" is:

..  an individual that is not a citizen or resident of the United States;

..  a corporation or other entity treated as a corporation for United States
   federal income tax purposes organized or created under non-U.S. law; or

..  an estate or trust that is not taxable in the U.S. on its worldwide income.

Withholding Taxes

Generally, payments of principal and interest on the notes will not be subject
to U.S. withholding taxes.

However, for the exemption from withholding taxes to apply to you, one of the
following requirements must be met. These requirements have been changed for
interest paid on or after January 1, 2001.

..  You provide a completed Form W-8BEN (or substitute form) to the bank, broker
   or other intermediary who holds the notes. The Form W-8BEN contains your
   name, address and a statement that you are the beneficial owner of the notes
   and that you are not a U.S. Holder.

..  You hold your notes directly through a "qualified intermediary", and the
   qualified intermediary has sufficient information in its files indicating
   that you are not a U.S. Holder. A qualified intermediary is a bank, broker
   or other intermediary that (1) is either a U.S. or non-U.S. entity, (2) is
   acting out of a non-U.S. branch or office and (3) has signed an agreement
   with the IRS providing that it will administer all or part of the U.S.
   withholding rules under specified procedures.

..  You are entitled to an exemption from withholding tax on interest under a
   tax treaty between the U.S. and your country of residence. To claim this
   exemption, you must generally complete Form W-8BEN and claim this exemption
   on the form. In some cases, you may instead be permitted to provide
   documentary evidence of your claim to the intermediary, or a qualified
   intermediary may already have some or all of the necessary evidence in its
   files.

..  The interest income on the notes is effectively connected with the conduct
   of your trade or business in the U.S., and is not exempt from U.S. tax under
   a tax treaty. To claim this exemption, you must complete Form W-8ECI.

Even if you meet one of the above requirements, interest paid to you will be
subject to withholding tax under any of the following circumstances:

..  The withholding agent or an intermediary knows or has reason to know that
   you are not entitled to an exemption from withholding tax. Specific rules
   apply for this test.

..  The IRS notifies the withholding agent that information that you or an
   intermediary provided concerning your status is false.

                                     S-21



..  An intermediary through which you hold the notes fails to comply with the
   procedures necessary to avoid withholding taxes on the notes. In particular,
   an intermediary is generally required to forward a copy of your Form W-8BEN
   (or other documentary information concerning your status) to the withholding
   agent for the notes. However, if you hold your notes through a qualified
   intermediary--or if there is a qualified intermediary in the chain of title
   between yourself and the withholding agent for the notes--the qualified
   intermediary will not generally forward this information to the withholding
   agent.

Interest payments made to you will generally be reported to the IRS and to you
on Form 1042-S. However, this reporting does not apply to you if one of the
following conditions applies:

..  You hold your notes directly through a qualified intermediary and the
   applicable procedures are complied with.

..  You file Form W-8ECI.

The rules regarding withholding are complex and vary depending on your
individual situation. They are also subject to change. In addition, special
rules apply to certain types of non-U.S. Holders, including partnerships,
trusts, and other entities treated as pass-through entities for U.S. federal
income tax purposes. We suggest that you consult with your tax advisor
regarding the specific methods for satisfying these requirements.

Sale or Retirement of Notes

If you sell a note or it is redeemed, you will not be subject to federal income
tax on any gain unless one of the following applies:

..  The gain is connected with a trade or business that you conduct in the U.S.

..  You are an individual, you are present in the U.S. for at least 183 days
   during the year in which you dispose of the note, and certain other
   conditions are satisfied.

..  The gain represents accrued interest, in which case the rules for interest
   would apply.

U.S. Trade or Business

If you hold your note in connection with a trade or business that you are
conducting in the U.S.:

..  Any interest on the note, and any gain from disposing of the note, generally
   will be subject to income tax as if you were a U.S. Holder.

..  If you are a corporation, you may be subject to the "branch profits tax" on
   your earnings that are connected with your U.S. trade or business, including
   earnings from the note. This tax is 30%, but may be reduced or eliminated by
   an applicable income tax treaty.

Estate Taxes

If you are an individual, your notes will not be subject to U.S. estate tax
when you die. However, this rule only applies if, at your death, payments on
the notes were not connected to a trade or business that you were conducting in
the U.S.

Information Reporting and Backup Withholding

U.S. rules concerning information reporting and backup withholding are
described above. These rules apply to Non-U.S. Holders as follows:

..  Principal and interest payments you receive will be automatically exempt
   from the usual rules if you are a Non-U.S. Holder exempt from withholding
   tax on interest, as described above. The exemption does not apply if the
   withholding agent or an intermediary knows or has reason to know that you
   should be subject to the usual information reporting or backup withholding
   rules. In addition, as described above, interest payments made to you may be
   reported to the IRS on Form 1042-S.

..  Sale proceeds you receive on a sale of your notes through a broker may be
   subject to information reporting and/or backup withholding if you are not
   eligible for an exemption. In particular, information reporting and backup
   withholding may apply if you use the U.S. office of a broker, and
   information reporting (but not backup withholding) may apply if you use the
   foreign office of a broker that has certain connections to the U.S. We
   suggest that you consult your tax advisor concerning information reporting
   and backup withholding on a sale.

                                     S-22



Possible European Union Requirements

The European Union is currently considering proposals for a new directive
regarding the taxation of savings income. According to the most recently
available information, it is proposed that, subject to a number of important
conditions being met, Member States will be required to provide to the tax
authorities of another Member State details of payments of interest or other
similar income paid by a person within its jurisdiction to an individual
resident in that other Member State, subject to the right of certain Member
States to opt instead for a withholding system for a transitional period in
relation to such payments. Full details of the proposals are not currently
available, and they may in any case be subject to further amendment.

                                     S-23



                                 UNDERWRITING

Under the terms and subject to the conditions contained in the underwriting
agreement dated the date hereof, the underwriters named below have severally
agreed to purchase, and we have agreed to sell to them severally, the
respective amount of the notes set forth below opposite their names. In the
underwriting agreement, the underwriters have agreed to purchase all the notes
if any notes are purchased.



                                                Principal Amount Principal Amount
Name                                             of 2007 Notes    of 2013 Notes
----                                            ---------------- ----------------
                                                           
Credit Suisse First Boston Corporation.........   $276,000,000     $207,000,000
Morgan Stanley & Co. Incorporated..............    276,000,000      207,000,000
ABN AMRO Incorporated..........................     40,000,000       30,000,000
Banc of America Securities LLC.................     40,000,000       30,000,000
Deutsche Bank Securities Inc...................     40,000,000       30,000,000
J.P. Morgan Securities Inc.....................     40,000,000       30,000,000
Salomon Smith Barney Inc.......................     40,000,000       30,000,000
Australia and New Zealand Banking Group Limited      8,000,000        6,000,000
Banca IMI S.p.A................................      8,000,000        6,000,000
Bank of Montreal...............................      8,000,000        6,000,000
BNP Paribas Securities Corp....................      8,000,000        6,000,000
Caboto IntesaBci--SIM S.p.A....................      8,000,000        6,000,000
Commerzbank Capital Markets Corporation........      8,000,000        6,000,000
                                                  ------------     ------------
       Total...................................   $800,000,000     $600,000,000
                                                  ============     ============


We have been advised by the underwriters that the underwriters propose to offer
the notes to the public initially at the public offering prices set forth on
the cover page of this prospectus supplement and to certain dealers at such
price less a concession not in excess of 0.20% of the principal amount of the
2007 Notes and 0.30% of the principal amount of the 2013 Notes; that the
underwriters may allow, and such dealers may reallow, a concession not in
excess of 0.15% of the principal amount of the 2007 Notes and 0.25% of the
principal amount of the 2013 Notes on sales to certain other dealers; and that
after the initial public offering, the public offering price and such
concessions may be changed by the underwriters.

We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act of 1933, as amended.

The notes are offered for sale in those jurisdictions in the United States,
Europe and Asia where it is legal to make such offers.

The underwriters have represented and agreed that (1) they have not taken any
action in any jurisdiction that would permit a public offering of the notes,
and will not possess or distribute this prospectus supplement and the
accompanying prospectus or any other offering material in any other
jurisdiction where action for that purpose is required and (2) they will comply
with all relevant laws and regulations in each jurisdiction in which they
(A) purchase, offer, sell or deliver notes or (B) have in their possession or
distribute the prospectus supplement and prospectus or any other offering
material.

The underwriters have agreed that they have not offered or sold, and will not
offer or sell, directly or indirectly, any of the notes in or to residents of
Japan or to any persons for reoffering or resale, directly or indirectly, in
Japan or to any resident of Japan unless an exemption from the registration
requirements of the Securities and Exchange Law is available and they are in
compliance with the other relevant laws of Japan.

The underwriters have represented and agreed that (1) they have not offered or
sold and before the date six months after the date of issue of the notes will
not offer or sell any notes to persons in the United Kingdom except to persons
whose ordinary activities involve them in acquiring, holding, managing or
disposing of investments (as principal or agent) for the purpose of their
businesses or otherwise in circumstances which have not resulted and will not
result in an offer to the public in the United Kingdom within the meaning of
the Public Offers of Securities Regulations 1995; (2) they have only
communicated or caused to be communicated and will only communicate or cause to
be communicated any invitation or inducement to engage in investment activity
(within the meaning of section 21 of the Financial Services and Markets Act of
2000 (the "FSMA")) received in connection with the issue or sale of any notes
in circumstances in which section 21(1) of the FSMA does not apply to the
issuer; and (3) they have complied and will comply with all applicable
provisions of the FSMA with respect to anything done in relation to the notes
in, from or otherwise involving the United Kingdom.

                                     S-24



Although application has been made to list the notes on the Luxembourg Stock
Exchange, a listing may not be obtained. In addition, the notes are a new issue
of securities with no established trading market. Alcoa has been advised by the
underwriters that they intend to make a market in the notes, but that they are
not obligated to do so and may discontinue such market-making at any time
without notice.

Purchasers of the notes may be required to pay stamp taxes and other charges in
accordance with the laws and practices of the country of purchase in addition
to the issue price set forth on the cover page hereof.

In connection with the offering of the notes, the underwriters may engage in
transactions that stabilize, maintain or otherwise affect the price of the
notes. Specifically, the underwriters may overallot in connection with the
offering of the notes, creating a syndicate short position. In addition, the
underwriters may bid for, and purchase, notes in the open market to cover
syndicate shorts or to stabilize the price of the notes. Finally, the
underwriting syndicate may reclaim selling concessions allowed for distributing
the notes in the offering of the notes, if the syndicate repurchases previously
distributed notes in syndicate covering transactions, stabilization
transactions or otherwise. Any of these activities may stabilize or maintain
the market price of the notes above independent market levels. The underwriters
are not required to engage in any of these activities and may end any of them
at any time.

Expenses associated with this offering to be paid by Alcoa are estimated at
$227,300.

Alain J. P. Belda, Director, Chairman of the Board and Chief Executive Officer
of Alcoa, and Franklin A. Thomas, a director of Alcoa, are also directors of
Citigroup Inc., an affiliate of Salomon Smith Barney Inc. The trustee and
calculation agent, J.P. Morgan Trust Company, National Association, is also an
affiliate of J.P. Morgan Securities Inc.

In the ordinary course of their respective businesses, the underwriters or
their affiliates have engaged, are engaging and may in the future engage in
investment banking, financial advisory and/or commercial banking transactions
with us and our affiliates. Morgan Stanley will reimburse a portion of its
underwriting fees to Alcoa in connection with a prior assignment.

Certain underwriters may make the notes available for distribution on the
Internet through a proprietary Web site and/or third-party system operated by
Market Axess Inc., an Internet-based communications technology provider. Market
Axess Inc. is providing the system as a conduit for communications between
these underwriters and their customers and is not a party to any transactions.
Market Axess Inc., a registered broker-dealer, will receive compensation from
certain underwriters based on transactions the underwriter conducted through
the system. Underwriters will make the notes available to their customers
through the Internet distributions, whether made through a proprietary or
third-party system, on the same terms as distributions made through other
channels.

                                 LEGAL MATTERS

The validity of the notes offered by this prospectus supplement will be passed
upon for Alcoa by Thomas F. Seligson, Esq., Counsel of Alcoa. Mr. Seligson is
paid a salary by Alcoa, is a participant in various employee benefit plans
offered by Alcoa to employees of Alcoa generally and has options to purchase
shares of Alcoa common stock. The underwriters have been represented by
Cravath, Swaine & Moore, New York, New York. Cravath, Swaine & Moore is
currently representing Alcoa in connection with various matters.

                                     S-25



                              GENERAL INFORMATION

Listing

Application has been made to list the notes on the Luxembourg Stock Exchange.
In connection with the listing application, Alcoa's articles of incorporation
and by-laws and a legal notice relating to the issuance of the notes have been
deposited before listing with the Chief Registrar of the District Court of
Luxembourg, where copies thereof may be obtained upon request. Copies of the
above documents together with this prospectus supplement, the accompanying
prospectus and the indenture and our current Annual Report on Form 10-K and
Quarterly Report on Form 10-Q as well as all such future reports, so long as
any of the notes are outstanding, will be made available for inspection at the
main office of Deutsche Bank Luxembourg S.A. in Luxembourg. Deutsche Bank
Luxembourg will act as intermediary for Alcoa and the holders of the notes. In
addition, copies of the above reports of Alcoa may be obtained free of charge
at such office. The underwriting agreement will be available for inspection at
the offices of Deutsche Bank Luxembourg.

Independent Accountants

The independent accountants of Alcoa are PricewaterhouseCoopers LLP.

Material Change

Other than as disclosed or contemplated herein or in the documents incorporated
herein by reference, there has been no material adverse change in our financial
position since June 30, 2002.

Litigation

Other than as disclosed or contemplated in the documents incorporated herein by
reference, neither we nor any of our subsidiaries is involved in litigation,
arbitration, or administrative proceedings relating to claims or amounts that
are material in the context of the issue of the notes and we are not aware of
any such litigation, arbitration, or administrative proceedings pending or
threatened.

Authorization

Resolutions relating to the issue and sale of the notes were adopted by the
Board of Directors of Alcoa on January 15, 1993, May 13, 1993, March 11, 1994,
November 10, 1995, March 13, 1998, March 10, 2000 and November 9, 2001.

Governing Law

The notes and the indenture are governed by, and shall be construed in
accordance with, the laws of the Commonwealth of Pennsylvania, United States of
America, applicable to agreements made and to be performed wholly within such
jurisdiction.

Identification Numbers

The notes have been accepted for clearing through Euroclear and Clearstream,
Luxembourg. The 2007 Notes have been assigned Common Code 015307196,
International Security Identification Number (ISIN) No. US013817 AG65 and CUSIP
No. 013817 AG6. The 2013 Notes have been assigned Common Code 015307218,
International Security Identification Number (ISIN) No. US013817 AH49 and CUSIP
No. 013817 AH4.

                                     S-26



PROSPECTUS



[LOGO] ALCOA

                                $5,000,000,000

                                  Alcoa Inc.

                                Debt Securities

                                Preferred Stock

                                 Common Stock

                                   Warrants

                           Stock Purchase Contracts

                             Stock Purchase Units

                                 Alcoa Trust I

 Trust Preferred Securities Fully and Unconditionally Guaranteed by Alcoa Inc.

                               -----------------

   Alcoa Inc. may sell from time to time in one or more offerings, together or
separately:

    .  senior debt securities
    .  subordinated debt securities
    .  preferred stock
    .  common stock
    .  warrants to purchase debt securities, preferred stock or common stock
    .  stock purchase contracts
    .  stock purchase units.

   Alcoa Inc.'s common stock is listed on the New York Stock Exchange under the
symbol "AA."

   Alcoa Trust I may sell trust preferred securities, fully and unconditionally
guaranteed on a subordinated basis
by Alcoa Inc.

   The securities offered by Alcoa Inc. and Alcoa Trust I may be issued in one
or more series or issuances and their total offering price, in the aggregate,
will not exceed $5,000,000,000. We will provide the specific terms of any
securities we actually offer for sale in supplements to this prospectus. You
should read this prospectus and the supplements carefully before you decide to
invest in any of these securities.

   The mailing address of the principal executive offices of Alcoa Inc. and
Alcoa Trust I is 201 Isabella Street, Pittsburgh, Pennsylvania 15212-5858. The
telephone number is (412) 553-4545.

                               -----------------

   Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus is truthful or complete. Any representation to the contrary is
a criminal offense.

   This prospectus may not be used to sell securities unless accompanied by a
prospectus supplement.

                               -----------------

               The date of this Prospectus is December 14, 2001.



                               TABLE OF CONTENTS



                                                                      Page
                                                                      ----
                                                                   
     About this Prospectus...........................................   3
     Where You Can Find More Information.............................   3
     Incorporation by Reference......................................   4
     Alcoa Inc.......................................................   5
     Alcoa Trust I...................................................   6
     Ratios of Earnings to Fixed Charges.............................   7
     Use of Proceeds.................................................   7
     Description of Senior Debt Securities...........................   8
     Description of Subordinated Debt Securities.....................  22
     Description of Preferred Stock..................................  29
     Description of Common Stock.....................................  33
     Description of Warrants.........................................  35
     Description of Stock Purchase Contracts and Stock Purchase Units  37
     Description of Trust Preferred Securities and Trust Guarantee...  38
     Plan of Distribution............................................  42
     Legal Matters...................................................  43
     Independent Accountants.........................................  43


                                      2



                             ABOUT THIS PROSPECTUS

   This prospectus is part of a "shelf" registration statement that Alcoa and
the Alcoa Trust have filed with the SEC. By using a shelf registration
statement, we may sell, from time to time, in one or more offerings, any
combination of the securities described in this prospectus in a dollar amount
that does not exceed $5,000,000,000. For further information about Alcoa's
business, the Alcoa Trust and the securities, you should refer to the
registration statement and its exhibits. The exhibits to our registration
statement contain the full text of certain contracts and other important
documents we have summarized in this prospectus. Since these summaries may not
contain all the information that you may find important in deciding whether to
purchase the securities we may offer, you should review the full text of these
documents. The registration statement can be obtained from the SEC as indicated
under the heading "Where You Can Find More Information."

   This prospectus only provides you with a general description of the
securities we may offer. Each time we sell securities, we will provide a
prospectus supplement that contains specific information about the terms of
those securities. The prospectus supplement may also add, update or change
information contained in this prospectus. You should read both this prospectus
and any prospectus supplement together with the additional information
described below under the heading "Where You Can Find More Information."

   You should rely only on the information contained or incorporated by
reference in this prospectus and the prospectus supplement. We have not
authorized anyone to provide you with different information. If anyone provides
you with different or inconsistent information, you should not rely on it. We
will not make an offer to sell these securities in any jurisdiction where the
offer or sale is not permitted. You should assume that the information
appearing in this prospectus, as well as information we previously filed with
the SEC and incorporated by reference in this prospectus, is accurate only as
of the date on the front cover of this prospectus. Our business, financial
condition, results of operations and prospects may have changed since that date.

                      WHERE YOU CAN FIND MORE INFORMATION

   Alcoa Inc. ("Alcoa" or "the Company") files annual, quarterly and current
reports, proxy statements and other information with the Securities and
Exchange Commission (the "SEC"). Its SEC filings are available over the
Internet at the SEC's web site at http://www.sec.gov. You also may read and
copy any document it files with the SEC at the SEC's public reference room at
450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549. Please call the SEC
at 1-800-SEC-0330 for more information on the public reference room and its
copy charges. Alcoa's common stock is listed and traded on the New York Stock
Exchange (the "NYSE"). You may also inspect the information it files with the
SEC at the NYSE's offices at 20 Broad Street, New York, New York 10005.

   No separate financial statements of Alcoa Trust I (the "Alcoa Trust") have
been included or incorporated by reference. Neither the Alcoa Trust nor Alcoa
considers financial statements of the Alcoa Trust material to holders of the
trust preferred securities because:

   . all of the voting securities of the Alcoa Trust will be owned, directly or
     indirectly, by Alcoa, a reporting company under the Securities Exchange
     Act of 1934, as amended (the "Exchange Act");

   . the Alcoa Trust has no independent operations and exists for the purpose
     of issuing securities representing undivided beneficial interests in the
     assets of the Alcoa Trust and investing the proceeds in the subordinated
     debt securities issued by Alcoa; and

   . the obligations of the Alcoa Trust under the trust preferred securities
     issued by it will be fully and unconditionally guaranteed on a
     subordinated basis by Alcoa to the extent described in this prospectus.


                                      3



                          INCORPORATION BY REFERENCE

   The SEC allows Alcoa to "incorporate by reference" the information in
documents it files with the SEC. This means that Alcoa can disclose important
information to you by referring you to those documents. Any information Alcoa
incorporates in this manner is considered part of this prospectus. Any
information Alcoa files with the SEC after the date of this prospectus will
automatically update and supersede the information contained or incorporated by
reference in this prospectus.

   Alcoa incorporates by reference the following documents that it has filed
with the SEC:

   . Annual Report on Form 10-K for the fiscal year ended December 31, 2000, as
     amended by Amendment No. 1 on Form 10-K/A filed on March 6, 2001;

   . Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31,
     2001, June 30, 2001 and September 30, 2001; and

   . Current Reports on Form 8-K filed on May 23, 2001, August 21, 2001,
     November 19, 2001, November 28, 2001 and December 6, 2001.

Alcoa also incorporates by reference any future filings it will make with the
SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date
of this prospectus, but before the end of the offering of the securities made
by this prospectus.

   You may request a copy of any filings referred to above (including any
exhibits that are specifically incorporated by reference), at no cost, by
contacting Alcoa at the following address or telephone number:

                                  Alcoa Inc.
                             Attention: Treasurer
                                390 Park Avenue
                         New York, New York 10022-4608
                           Telephone: (212) 836-2600

                                      4



                                  ALCOA INC.

   Alcoa is the world's leading producer of primary aluminum, fabricated
aluminum and alumina, and is active in all major aspects of the industry:
technology, mining, refining, smelting, fabricating and recycling. Alcoa serves
customers worldwide in the packaging, consumer, automotive and transportation,
aerospace, building and construction, industrial products and distribution
markets. Related businesses include packaging machinery, precision castings,
vinyl siding, plastic bottles and closures, fiber optic cables and electrical
distribution systems for cars and trucks.

   Alcoa's operations consist of five worldwide segments: Alumina and
Chemicals, Primary Metals, Flat-Rolled Products, Engineered Products and
Packaging and Consumer. Alcoa businesses that are not reported to management as
part of one of these five segments are aggregated and reported as "Other."

   Alumina and Chemicals--This segment's activities include the mining of
bauxite, which is then refined into alumina. Alumina is sold to internal and
external customers worldwide or processed into industrial chemical products.
The alumina assets of Reynolds Metals Company ("Reynolds") acquired in 2000
which were required to be and have been divested were not included in this
segment before divestiture.

   Primary Metals--This segment consists of Alcoa's worldwide smelter system
and includes the smelting operations of Reynolds acquired in 2000. Primary
Metals receives alumina from the Alumina and Chemicals segment and produces
aluminum ingot to be used by Alcoa's fabricating businesses, as well as sold to
outside customers. Also included in this segment are revenues from the sale of
powder, excess power and results from internal hedging contracts.

   Flat-Rolled Products--This segment's principal business is the production
and sale of aluminum plate, sheet and foil. This segment includes rigid
container sheet, which is used to produce aluminum beverage cans, and sheet and
plate used in the transportation and distributor markets.

   Engineered Products--This segment consists of hard- and soft-alloy
extrusions, including architectural extrusions, super-alloy castings, steel and
aluminum fasteners, aluminum forgings and wheels. These products serve the
transportation, construction and distributor markets.

   Packaging and Consumer--This segment includes the packaging and consumer
businesses of Reynolds acquired in 2000, as well as Alcoa's closures,
packaging, PET bottles and packaging machinery businesses. Before the
acquisition of Reynolds, Alcoa's closures, packaging, PET bottles and packaging
machinery businesses were included in the Other group.

   Other--This group includes Alcoa Fujikura Ltd., which produces fiber-optic
cable, provides services for the telecommunications industry and produces
electrical components for the automotive industry; the residential building
products operations, Alcoa Building Products; and aluminum automotive
engineering and parts businesses. On April 20, 2001, Alcoa sold Thiokol
Propulsion, a producer of solid rocket propulsion systems, which had been
included in this group. On November 1, 2001, Alcoa announced it had completed a
merger of its metals distribution business, Reynolds Aluminum Supply Company
(known as RASCO), which had been included in this group, with BHP Billiton
Group's North America metals distribution business. Alcoa and BHP each own 50%
of the new, independently managed company called Integris Metals.

   Alcoa has operating locations in 37 countries. The principal executive
offices of Alcoa are located at 201 Isabella Street, Pittsburgh, Pennsylvania
15212-5858 (telephone: (412) 553-4545).

                                      5



                                 ALCOA TRUST I

   The Alcoa Trust is a statutory business trust formed under Delaware law
pursuant to:

   . a Declaration of Trust (a "Declaration") executed by Alcoa, as sponsor for
     the Alcoa Trust, and the trustees of the Alcoa Trust; and

   . the filing of a certificate of trust with the Delaware Secretary of State.

   Unless an accompanying prospectus supplement provides otherwise, the Alcoa
Trust exists for the sole purposes of:

   . selling trust preferred securities and investing the proceeds in a
     specific series of subordinated debt securities issued by Alcoa;

   . issuing and selling common securities to Alcoa in exchange for cash and
     investing the proceeds in additional subordinated debt securities issued
     by Alcoa; and

   . engaging in other activities that are necessary, convenient or incidental
     to the sale of trust preferred and common securities or the purchase of
     Alcoa debt securities.

   The Alcoa Trust will not borrow money, issue debt or reinvest proceeds
derived from investments, pledge any of its assets, or otherwise undertake, or
permit to be undertaken, any activity that would cause the Alcoa Trust not to
be classified for United States Federal income tax purposes as a grantor trust.
Alcoa will own all of the trust common securities issued by the Alcoa Trust.
The trust common securities will rank pari passu, and payments will be made
thereon pro rata, with the trust preferred securities, except that upon the
occurrence and continuance of an event of default under the Declaration, the
rights of the holders of the trust common securities to payment in respect of
distributions and payments upon liquidation, redemption and otherwise will be
subordinated to the rights of the holders of the trust preferred securities. In
connection with the issuance of trust preferred securities by the Alcoa Trust,
Alcoa will acquire trust common securities having an aggregate liquidation
amount equal to a minimum of 3% of the total capital of the Alcoa Trust. The
Alcoa Trust will have a term of 40 years, but may terminate earlier as provided
in the Declaration.

   The Alcoa Trust's business and affairs will be conducted by the trustees.
The holder of the trust common securities will be entitled to appoint, remove
or replace any of, or increase or reduce the number of, the trustees of the
Alcoa Trust. The duties and obligations of the trustees will be governed by the
Declaration of the Alcoa Trust. At least one of the trustees of the Alcoa Trust
will be a person who is an employee or officer of or who is affiliated with
Alcoa (a "Regular Trustee"). One trustee of the Alcoa Trust will be a financial
institution that is not affiliated with Alcoa, which will act as property
trustee and as indenture trustee for the purposes of the Trust Indenture Act of
1939, as amended (the "Trust Indenture Act"), pursuant to the terms set forth
in the applicable prospectus supplement (the "Property Trustee"). In addition,
unless the Property Trustee maintains a principal place of business in the
State of Delaware and otherwise meets the requirements of applicable law, one
trustee of the Alcoa Trust will be a legal entity having a principal place of
business in, or an individual resident of, the State of Delaware (the "Delaware
Trustee").

   Alcoa will pay all fees and expenses related to the Alcoa Trust and the
offering of the trust preferred securities. Unless otherwise set forth in the
prospectus supplement, the Property Trustee will be The Chase Manhattan Bank,
and the Delaware Trustee will be Chase Manhattan Bank Delaware. The office of
the Delaware Trustee in the State of Delaware is 1201 Market Street,
Wilmington, Delaware 19801. The principal place of business of the Alcoa Trust
is c/o Alcoa Inc., 201 Isabella Street, Pittsburgh, Pennsylvania 15212-5858
(telephone: (412) 553-4545).

                                      6



                      RATIOS OF EARNINGS TO FIXED CHARGES

   The following table sets forth the ratio of Alcoa's earnings to fixed
charges for the periods indicated:



                     Nine Months
                        Ended
                    September 30,   Year Ended December 31,
                    -------------   ------------------------
                        2001        2000 1999 1998 1997 1996
                        ----        ---- ---- ---- ---- ----
                                         
                         6.0        6.5  8.1  7.0  9.2  7.1


   The ratios include all earnings, before extraordinary items and the
cumulative effects of accounting changes, and fixed charges of Alcoa and its
majority owned subsidiaries. Earnings have been calculated by adding to net
income the provision for taxes on income, amortization of capitalized interest,
interest expense and an amount representative of the interest factor in
rentals, the distributed income of less than 50% owned entities, and have been
decreased by the undistributed earnings of entities less than 50% owned,
preferred stock dividend requirements of majority owned subsidiaries and the
minority interest share in the losses of majority owned subsidiaries without
fixed charges of Alcoa. Fixed charges consist of total interest expense,
amortization of debt expense, an amount representative of the interest factor
in rentals, capitalized interest and preferred stock dividend requirements of
majority owned subsidiaries.

                                USE OF PROCEEDS

   Unless otherwise specified in a prospectus supplement, Alcoa will use the
net proceeds from the sale of the securities offered by it for general
corporate purposes, including repayment of borrowings (including borrowings
under Alcoa's commercial paper program), working capital, capital expenditures,
stock repurchase programs and acquisitions. Unless otherwise specified in a
prospectus supplement, the Alcoa Trust will use the net proceeds from the sale
of the trust preferred securities to purchase subordinated debt securities of
Alcoa.

                                      7



                     DESCRIPTION OF SENIOR DEBT SECURITIES

   The following description sets forth certain general terms and provisions of
the senior debt securities Alcoa may offer from time to time in the future. The
particular terms of the senior debt securities and the extent, if any, to which
the following general provisions may apply to any series of senior debt
securities will be described in the related prospectus supplement.

   Senior debt securities may be issued, from time to time, in one or more
series under an indenture, dated as of September 30, 1993, between Alcoa and
J.P. Morgan Trust Company, N.A. (formerly known as Chase Manhattan Trust
Company, N.A.) as successor trustee, or another trustee that is named in a
prospectus supplement. The indenture is filed with the SEC and incorporated by
reference as an exhibit to the registration statement of which this prospectus
is a part. The following summary of certain provisions of the indenture and the
senior debt securities is not meant to be complete. For more information, you
should refer to the full text of the indenture and the senior debt securities,
including the definitions of terms used and not defined in this prospectus or
the prospectus supplement.

General

   The indenture does not limit the aggregate principal amount of senior debt
securities that Alcoa may issue. Unless otherwise specified in a prospectus
supplement, the senior debt securities:

   . will be unsecured obligations of Alcoa;

   . may be issued under the indenture from time to time in separate series up
     to the aggregate amount from time to time authorized by Alcoa for each
     series; and

   . will rank on a parity with all other unsecured and unsubordinated
     indebtedness of Alcoa.

   A prospectus supplement will describe the following terms of any series of
senior debt securities Alcoa may offer:

   . the title;

   . any limit on the aggregate principal amount that Alcoa may issue;

   . whether the senior debt securities are to be issuable as registered
     securities or bearer securities or both, whether any of the senior debt
     securities are to be issuable initially in temporary global form and
     whether any of the senior debt securities are to be issuable in permanent
     global form;

   . the price(s), expressed as a percentage of aggregate principal amount, at
     which the senior debt securities will be issued;

   . the date(s) of maturity;

   . any rate(s) of interest or the formula pursuant to which interest rate(s)
     will be determined, and the date from which interest will accrue;

   . the interest payment dates on which any interest on the senior debt
     securities will be payable, the regular record date for any interest
     payable on any senior debt securities which are registered securities on
     any interest payment date and the extent to which, or the manner in which,
     any interest payable on a temporary global senior debt security on an
     interest payment date will be paid if other than in the manner described
     under "Temporary Global Securities" below;

   . the person to whom any interest on any registered security of the series
     will be payable if other than the person in whose name the registered
     security is registered at the close of business on the regular record date
     for the interest as described under "Payment and Paying Agents" below, and
     the manner in which any interest on any bearer security will be paid if
     other than in the manner described under "Payment and Paying Agents" below;

   . any mandatory or optional sinking fund or analogous provisions;

                                      8



   . each office or agency where, subject to the terms of the indenture as
     described below under "Payment and Paying Agents," the principal of and
     any premium and interest on the senior debt securities will be payable and
     each office or agency where, subject to the terms of the indenture as
     described below under "Form, Exchange, Registration and Transfer," the
     senior debt securities may be presented for registration of transfer or
     exchange;

   . any date after which and the price(s) at which the senior debt securities
     may, pursuant to any optional or mandatory redemption provisions, be
     redeemed, in whole or in part, and the other detailed terms and provisions
     of any optional or mandatory redemption provisions;

   . the denominations in which any senior debt securities that are registered
     securities will be issuable, if other than denominations of $1,000 and any
     integral multiple thereof, and the denomination or denominations in which
     any senior debt securities that are bearer securities will be issuable, if
     other than the denomination of $5,000;

   . the currency, currencies or currency units of payment of principal of and
     any premium and interest on the senior debt securities and the manner of
     determining the U.S. dollar equivalent for purposes of determining
     outstanding senior debt securities of the series;

   . any index used to determine the amount of payments of principal of and any
     premium and interest on the senior debt securities;

   . the portion of the principal amount of the senior debt securities, if
     other than the principal amount, payable upon acceleration of maturity;

   . if other than the trustee, the person who will be the security registrar
     of senior debt securities;

   . whether the senior debt securities will be subject to defeasance or
     covenant defeasance as described under "Defeasance and Covenant
     Defeasance";

   . any terms and conditions under which the senior debt securities of the
     series are convertible into or exchangeable for other securities of Alcoa
     or another issuer;

   . whether the senior debt securities of the series will be issuable in whole
     or in part in the form of one or more book-entry securities and, in such
     case, the depository or depositories for such book-entry debt security or
     book-entry securities and any circumstances other than those set forth in
     the indenture in which any such book-entry security may be transferred to,
     and registered and exchanged for senior debt securities registered in the
     name of, a person other than the depository for such book-entry security
     or a nominee thereof and in which any such transfer may be registered;

   . any other terms of the senior debt securities not inconsistent with the
     provisions of the indenture (Section 301); and

   . any special provisions for the payment of additional amounts with respect
     to the senior debt securities.

   Senior debt securities may be issued at a substantial discount below their
stated principal amount. Certain United States Federal income tax
considerations applicable to senior debt securities issued at a discount and to
senior debt securities that are denominated in a currency other than United
States dollars will be described in the applicable prospectus supplement.

   Senior debt securities may also be issued under the indenture upon the
exercise of warrants, in connection with a stock purchase contract or as part
of a stock purchase unit. See "Description of Warrants" and "Description of
Stock Purchase Contracts and Stock Purchase Units."

Form, Exchange, Registration and Transfer

   Senior debt securities may be issued in registered form or bearer form or
both, as specified in the terms of the series. Unless otherwise indicated in an
applicable prospectus supplement, definitive bearer securities will

                                      9



have interest coupons attached. (Section 201) Senior debt securities of a
series may also be issuable in temporary and permanent global form. (Section
201) See "Permanent Global Securities."

   In connection with its sale during the restricted period (as defined in
United States Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7)), no bearer
security, including a senior debt security in permanent global form, may be
mailed or otherwise delivered to any location in the United States or its
possessions. No bearer security other than a temporary global bearer security
may be delivered, nor may interest be paid on any bearer security unless the
person entitled to receive the bearer security or interest furnishes written
certification, in the form required by the indenture, to the effect that such
person:

   . is not a United States person;

   . is a foreign branch of a United States financial institution purchasing
     for its own account or for resale, or is a United States person who
     acquired the senior debt security through such a financial institution and
     who holds the senior debt security through such financial institution on
     the date of certification. In either of such cases, such financial
     institution must provide a certificate to Alcoa or the distributor selling
     the senior debt security to it stating that it agrees to comply with the
     requirements of Section 165(j)(3)(A), (B) or (C) of the Internal Revenue
     Code of 1986, as amended, and the United States Treasury Regulations
     thereunder; or

   . is a financial institution holding for purposes of resale during the
     restricted period (as defined in United States Treasury Regulations
     Section 1.163-5(c)(2)(i)(D)(7)).

   A financial institution holding for purposes of resale during the restricted
period, whether or not also satisfying the other two prongs of the above
sentence, must certify that it has not acquired the senior debt security for
purposes of resale directly or indirectly to a United States person or to a
person within the United States or its possessions. In the case of a bearer
security in permanent global form, such certification must be given in
connection with notation of a beneficial owner's interest therein. (Section
303) See "Temporary Global Securities."

   Senior debt securities may be presented for exchange as follows:

   . Registered securities will be exchangeable for other registered securities
     of the same series.

   . If senior debt securities have been issued as both registered securities
     and bearer securities, subject to certain conditions, holders may exchange
     bearer securities for registered securities of the same series of any
     authorized denominations and of a like aggregate principal amount and
     tenor.

   . Bearer securities surrendered in exchange for registered securities
     between a regular record date or a special record date and the relevant
     date for payment of interest must be surrendered without the coupon
     relating to such date for payment of interest and interest will not be
     payable in respect of the registered security issued in exchange for such
     bearer security, but will be payable only to the holder of such coupon
     when due in accordance with the terms of the indenture.

   . Bearer securities will not be issued in exchange for registered securities.

   . Each bearer security other than a temporary global bearer security will
     bear a legend substantially to the following effect: "Any United States
     Person who holds this obligation will be subject to limitations under the
     United States income tax laws, including the limitations provided in
     Sections 165(j) and 1287(a) of the Internal Revenue Code."

   Registered securities may be presented for registration of transfer, with
the form of transfer endorsed thereon duly executed, if so required by Alcoa or
the trustee or any transfer agent, at the office of the security registrar or
at the office of any transfer agent designated by Alcoa for that purpose with
respect to any series of senior debt securities and referred to in the
applicable prospectus supplement, without service charge and upon payment of
any taxes and other governmental charges as described in the indenture. Any
transfer or exchange

                                      10



will be effected once the security registrar or transfer agent, as the case may
be, is satisfied with the documents of title and identity of the person making
the request. (Section 305)

   If a prospectus supplement refers to any transfer agents, in addition to the
security registrar, initially designated by Alcoa with respect to any series of
senior debt securities, Alcoa may at any time rescind the designation of any
additional transfer agent or approve a change in the location through which any
transfer agent acts. If senior debt securities of a series are issuable solely
as registered securities, Alcoa will be required to maintain a transfer agent
in each place of payment for the series. If senior debt securities of a series
are issuable as bearer securities, Alcoa will be required to maintain, in
addition to the security registrar, a transfer agent in a place of payment for
the series located outside the United States. Alcoa may at any time designate
additional transfer agents with respect to any series of senior debt
securities. (Section 1002)

   If debt securities of a series are redeemed in part, Alcoa will not be
required to:

   . issue, register the transfer of or exchange senior debt securities of the
     series during a period beginning at the opening of business 15 days before
     any selection of senior debt securities of that series to be redeemed and
     ending at the close of business on:

       . if senior debt securities of the series are issuable only as
         registered securities, the day of mailing of the relevant notice of
         redemption, and

       . if senior debt securities of the series are issuable as bearer
         securities, the day of the first publication of the relevant notice of
         redemption or, if senior debt securities of the series are also
         issuable as registered securities and there is no publication, the
         mailing of the relevant notice of redemption;

   . register the transfer of or exchange any registered security, or portion
     thereof, called for redemption, except the unredeemed portion of any
     registered security being redeemed in part; or

   . exchange any bearer security called for redemption, except to exchange
     such bearer security for a registered security of that series and like
     tenor which is immediately surrendered for redemption. (Section 305)

Payment and Paying Agents

   Unless otherwise indicated in an applicable prospectus supplement, payment
of principal of and any premium and interest on registered securities will be
made at the office of the paying agent(s) designated by Alcoa from time to
time. At the option of Alcoa, payment of any interest may instead be made by
check mailed to the address of the person entitled thereto as such address
appears in the security register. Unless otherwise indicated in an applicable
prospectus supplement, payment of any installment of interest on registered
securities will be made to the person in whose name the registered security is
registered at the close of business on the regular record date for that
interest. (Section 307)

   Unless otherwise indicated in an applicable prospectus supplement, payment
of principal of and any premium and interest on bearer securities will be
payable, subject to any applicable laws and regulations, at the offices of
paying agents outside the United States as Alcoa may designate from time to
time by check or by transfer, at the option of the holder, to an account
maintained by the payee with a bank located outside the United States. Unless
otherwise indicated in an applicable prospectus supplement, payment of interest
on bearer securities on any interest payment date will be made only against
surrender outside the United States, to the paying agent, of the coupon
relating to that interest payment date. (Section 1001) No payment with respect
to any bearer security will be made at any office or agency of Alcoa in the
United States or by check mailed to any address in the United States or by
transfer to an account maintained with a bank located in the United States.
Notwithstanding the foregoing, payments of principal of and any premium and
interest on bearer securities denominated and payable in U.S. dollars will be
made at the office of Alcoa's paying agent in the Borough of Manhattan, the
City of New York, if, but only if, payment of the full amount thereof in U.S.
dollars at all offices or agencies outside the United States is illegal or
effectively precluded by exchange controls or other similar restrictions.
(Section 1002)

                                      11



   Unless otherwise indicated in an applicable prospectus supplement, the
corporate trust office of the trustee in Pittsburgh, Pennsylvania will be
designated as a paying agent for Alcoa for payments with respect to senior debt
securities which are issuable solely as registered securities. Alcoa will
maintain a paying agent outside of the United States for payments with respect
to senior debt securities, subject to the limitations described above on bearer
securities, which are issuable solely as bearer securities, or as both
registered securities and bearer securities. Any paying agents outside the
United States and any other paying agents in the United States initially
designated by Alcoa for the senior debt securities will be named in an
applicable prospectus supplement. Alcoa may at any time designate additional
paying agents or rescind the designation of any paying agent or approve a
change in the office through which any paying agent acts. If senior debt
securities of a series are issuable solely as registered securities, Alcoa will
be required to maintain a paying agent in each place of payment for the series.
If senior debt securities of a series are issuable as bearer securities, Alcoa
will be required to maintain:

   . a paying agent in the Borough of Manhattan, the City of New York, for
     payments with respect to any registered securities of the series and for
     payments with respect to bearer securities of the series in the
     circumstances described above, but not otherwise; and

   . a paying agent in a place of payment located outside the United States
     where senior debt securities of the series and any coupons appertaining
     thereto may be presented and surrendered for payment. If the senior debt
     securities of such series are listed on The Stock Exchange of the United
     Kingdom and the Republic of Ireland or the Luxembourg Stock Exchange or
     any other stock exchange located outside the United States and such stock
     exchange so requires, Alcoa will maintain a paying agent in London or
     Luxembourg or any other required city located outside the United States,
     as the case may be, for the senior debt securities of such series.
     (Section 1002)

   All moneys paid by Alcoa to a paying agent for the payment of principal of
and any premium or interest on any senior debt security which remain unclaimed
at the end of two years after such principal, premium or interest becomes due
and payable will be repaid to Alcoa. Thereafter, the holder of any such senior
debt security or any coupon may look only to Alcoa for payment. (Section 1003)

Book-Entry Securities

   The senior debt securities of a series may be issued in the form of one or
more registered securities that will be registered in the name of a depository
or its nominee and bear a legend as specified in the indenture. These senior
debt securities will be known as book-entry securities. Unless otherwise
indicated in the applicable prospectus supplement, a book-entry security may
not be registered for transfer or exchange to any person other than the
depository or its nominee unless:

   . the depository notifies Alcoa that it is unwilling to continue as
     depository or ceases to be a clearing agency registered under the Exchange
     Act;

   . Alcoa executes and delivers to the trustee a company order that the
     transfer or exchange of the book-entry security will be registrable; or

   . there has occurred and is continuing an event of default, or an event that
     after notice or lapse of time, or both, would be an event of default, with
     respect to the senior debt securities evidenced by the book-entry security.

Upon the occurrence of any of the conditions specified above or other
conditions as may be specified as contemplated by the indenture, the book-entry
security may be exchanged for senior debt securities of the series registered
in the names of, and the transfer of the book-entry security may be registered
to, such persons, including persons other than the depository with respect to
such series and its nominees, as the depository may direct.

   The specific terms of the depositary arrangement with respect to any portion
of a series of registered book-entry securities to be represented by a
book-entry security will be described in the applicable prospectus supplement.
Alcoa expects that the following provisions will apply to depositary
arrangements.

                                      12



   Unless otherwise specified in the applicable prospectus supplement, senior
debt securities that are to be represented by a book-entry security to be
deposited with or on behalf of a depository will be represented by a book-entry
security registered in the name of the depository or its nominee. Upon the
issuance of a book-entry security, and the deposit of the book-entry security
with or on behalf of the depository, the depository will credit, on its
book-entry registration and transfer system, the respective principal amounts
of the senior debt securities represented by the book-entry security to the
accounts of institutions that have accounts with the depository or its nominee.
The accounts to be credited will be designated by the underwriters or agents of
the senior debt securities or by Alcoa if the senior debt securities are
offered and sold directly by Alcoa. Ownership of beneficial interests in a
book-entry security will be limited to the institutions that have accounts with
the depository or persons that may hold interests through the institutions.
Ownership of beneficial interests by the institutions in the book-entry
security will be shown on, and the transfer of that ownership interest will be
effected only through, records maintained by the depository or its nominee for
the book-entry security. Ownership of beneficial interests in the book-entry
security by persons that hold through the institutions will be shown on, and
the transfer of that ownership interest within the institution will be effected
only through, records maintained by that institution. The laws of some
jurisdictions require that certain purchasers of securities take physical
delivery of securities in certificated form. The foregoing limitations and such
laws may impair the ability to transfer beneficial interests in book-entry
securities.

   So long as the depository for a book-entry security, or its nominee, is the
registered owner of that book-entry security, the depository or nominee, as the
case may be, will be considered the sole owner or holder of the senior debt
securities represented by the book-entry security for all purposes under the
indenture. Unless otherwise specified in the applicable prospectus supplement,
owners of beneficial interests in a book-entry security:

   . will not be entitled to have senior debt securities of the series
     registered in their names;

   . will not receive or be entitled to receive physical delivery of senior
     debt securities in certificated form; and

   . will not be considered the holders of debt securities for any purposes
     under the indenture. (Sections 204 and 305)

Accordingly, each person owning a beneficial interest in a book-entry security
must rely on the procedures of the depository and, if such person does not have
an account with the depository, on the procedures of the institution through
which such person owns its interest, to exercise any rights of a holder under
the indenture. The indenture provides that the depository may grant proxies and
otherwise authorize participants to give or take any request, demand,
authorization, direction, notice, consent, waiver or other action that a holder
is entitled to give or take under the indenture. (Section 104) Alcoa
understands that under existing industry practices, if Alcoa requests any
action of holders, or if an owner of a beneficial interest in such book-entry
security desires to give any notice or take any action a holder is entitled to
give or take under the indenture, the depository would authorize the
participants to give such notice or take such action, and participants would
authorize beneficial owners owning through such participants to give such
notice or take such action or would otherwise act upon the instructions of
beneficial owners owning through them.

Temporary Global Securities

   If so specified in an applicable prospectus supplement, all or any portion
of the senior debt securities of a series that are issuable as bearer
securities may initially be represented by one or more temporary global senior
debt securities, without interest coupons, to be deposited with a common
depositary in London for the Euroclear System ("Euroclear") and Clearstream
Luxembourg for credit to the designated accounts. On and after the date
determined as provided in any temporary global senior debt security and
described in an applicable prospectus supplement, each temporary global senior
debt security will be exchanged for an interest in a permanent global

                                      13



bearer security as specified in an applicable prospectus supplement, but,
unless otherwise specified in an applicable prospectus supplement, only upon
receipt of:

   . written certification from Euroclear or Clearstream Luxembourg, as the
     case may be, in the form and to the effect required by the indenture (a
     "Depository Tax Certification"); and

   . written certification by Euroclear or Clearstream Luxembourg from the
     person entitled to receive such senior debt securities in the form and to
     the effect described under "Form, Exchange, Registration and Transfer."

No definitive bearer security, including a senior debt security in permanent
global form that is either a bearer security or exchangeable for bearer
securities, delivered in exchange for a portion of a temporary or permanent
global senior debt security may be mailed or otherwise delivered to any
location in the United States in connection with such exchange. (Section 304)

   Unless otherwise specified in an applicable prospectus supplement, interest
in respect of any portion of a temporary global senior debt security payable in
respect of an interest payment date occurring before the issuance of securities
in permanent global form will be paid to each of Euroclear and Clearstream
Luxembourg with respect to the portion of the temporary global senior debt
security held for its account following the receipt by Alcoa or its agent of a
Depository Tax Certification. Each of Euroclear and Clearstream Luxembourg will
undertake in such circumstances to credit such interest received by it in
respect of a temporary global senior debt security to the respective accounts
for which it holds such temporary global senior debt security only upon receipt
in each case of certification in the form and to the effect described under
"Form, Exchange, Registration and Transfer" with respect to the portion of such
temporary global senior debt security on which such interest is to be so
credited. Receipt of the certification described in the preceding sentence by
Euroclear or Clearstream Luxembourg, as the case may be, will constitute
irrevocable instructions to Euroclear or Clearstream Luxembourg to exchange
such portion of the temporary global senior debt security with respect to which
such certification was received for an interest in a permanent global senior
debt security.

Permanent Global Securities

   If any senior debt securities of a series are issuable in permanent global
form, the applicable prospectus supplement will describe any circumstances
under which beneficial owners of interests in any such permanent global senior
debt security may exchange their interests for senior debt securities of the
series and of like tenor and principal amount in any authorized form and
denomination. No bearer security delivered in exchange for a portion of a
permanent global senior debt security may be mailed or otherwise delivered to
any location in the United States in connection with the exchange. (Section 305)

   A person having a beneficial interest in a permanent global senior debt
security will, except with respect to payment of principal of and any premium
and interest on the permanent global senior debt security, be treated as a
holder of the principal amount of outstanding senior debt securities
represented by the permanent global senior debt security as is specified in a
written statement of:

   . the holder of the permanent global senior debt security, or

   . in the case of a permanent global senior debt security in bearer form, the
     operator of Euroclear or Clearstream Luxembourg,

which is produced to the trustee by such person. (Section 203) Principal of and
any premium and interest on a permanent global senior debt security will be
payable in the manner described in the applicable prospectus supplement.

                                      14



Certain Limitations

   The indenture contains the covenants and limitations summarized below. These
covenants and limitations will be applicable, unless waived or amended, so long
as any of the senior debt securities are outstanding, unless stated otherwise
in the prospectus supplement.

   Liens.  Alcoa covenants that it will not create, incur, assume or guarantee,
and will not permit any Restricted Subsidiary to create, incur, assume or
guarantee, any indebtedness for borrowed money secured by a mortgage, security
interest, pledge, charge or similar encumbrance ("mortgages") upon any
Principal Property of Alcoa or any Restricted Subsidiary or upon any shares of
stock or indebtedness of any Restricted Subsidiary without equally and ratably
securing the senior debt securities. The foregoing restriction, however, will
not apply to:

   . mortgages on property, shares of stock or indebtedness of any corporation
     existing at the time such corporation becomes a Restricted Subsidiary;

   . mortgages on property existing at the time of acquisition of such property
     by Alcoa or a Restricted Subsidiary or mortgages to secure the payment of
     all or any part of the purchase price of such property upon the
     acquisition or to secure any indebtedness incurred before, at the time of,
     or within 180 days after, the acquisition of such property for the purpose
     of financing all or any part of the purchase price thereof, or mortgages
     to secure the cost of improvements to such acquired property;

   . mortgages to secure indebtedness of a Restricted Subsidiary to Alcoa or
     another Restricted Subsidiary;

   . mortgages existing at the date of the indenture;

   . mortgages on property of a corporation existing at the time such
     corporation is merged into or consolidated with Alcoa or a Restricted
     Subsidiary or at the time of a sale, lease, or other disposition of the
     properties of a corporation as an entirety or substantially as an entirety
     to Alcoa or a Restricted Subsidiary;

   . certain mortgages in favor of governmental entities; or

   . extensions, renewals or replacements of any mortgage referred to in the
     above listed exceptions. (Section 1009)

   Notwithstanding the restrictions outlined in the preceding paragraph, Alcoa
or any Restricted Subsidiary will be permitted to create, incur, assume or
guarantee any indebtedness secured by a mortgage without equally and ratably
securing the senior debt securities, if after giving effect thereto, the
aggregate amount of all indebtedness so secured by mortgages, not including
mortgages permitted under the listed exceptions above, does not exceed 10% of
Consolidated Net Tangible Assets. (Section 1009)

   Sale and Leaseback Arrangements.  Alcoa covenants that it will not, nor will
it permit any Restricted Subsidiary to, enter into any arrangement with any
person providing for the leasing to Alcoa or any Restricted Subsidiary of
Principal Property, where such Principal Property has been or is to be sold or
transferred by Alcoa or such Restricted Subsidiary to such person, unless
either:

   . Alcoa or such Restricted Subsidiary would be entitled to create, incur,
     assume or guarantee indebtedness secured by a mortgage on such Principal
     Property at least equal in amount to the Attributable Debt with respect to
     such arrangement, without equally and ratably securing the senior debt
     securities pursuant to the limitation in the indenture on liens; or

   . Alcoa applies an amount equal to the greater of the net proceeds of such
     sale or the Attributable Debt with respect to such arrangement to the
     retirement of indebtedness that matures more than twelve months after the
     creation of such indebtedness.

                                      15



   This restriction on sale and leaseback transactions does not apply to any
transaction:

   . involving a lease for a term of not more than three years; or

   . between Alcoa and a Restricted Subsidiary or between Restricted
     Subsidiaries. (Section 1010)

   Highly leveraged transactions.  The indenture does not contain provisions
that would afford protection to the holders of the senior debt securities in
the event of a highly leveraged transaction involving Alcoa.

Certain Definitions

   The following are definitions of capitalized words used in this summary.
These and other definitions are set forth in their entirety in the indenture.

   "Attributable Debt" when used in connection with a sale and leaseback
transaction referred to above means, at the time of determination, the lesser
of:

   . the fair value of such property as determined by Alcoa's board of
     directors; or

   . the present value, discounted at the annual rate of 9%, compounded
     semi-annually, of the obligation of the lessee for net rental payments
     during the remaining term of the lease, including any period for which
     such lease has been extended.

   "Bearer Security" means any senior debt security established under the
indenture that is payable to bearer.

   "Book-entry security" means a registered security bearing the legend
specified in Section 204 of the indenture, evidencing all or part of a series
of senior debt securities, issued to the depository for such series or its
nominee, and registered in the name of such depository or nominee. Book-entry
securities will not be deemed to be securities in global form for purposes of
Sections 201 and 203 and Article Three of the indenture.

   "Common Stock" includes any stock of any class of Alcoa that has no
preference in respect of dividends or of amounts payable in the event of any
voluntary or involuntary liquidation, dissolution or winding-up of Alcoa and
which is not subject to redemption by Alcoa. However, subject to the provisions
of Section 1511 of the indenture, shares issuable on conversion of senior debt
securities will include only shares of the class designated as common stock of
Alcoa at September 30, 1993 or shares of any class or classes resulting from
any reclassification or reclassifications thereof and which have no preference
in respect of dividends or of amounts payable in the event of any voluntary or
involuntary liquidation, dissolution or winding-up of Alcoa and which are not
subject to redemption by Alcoa. If at any time there is more than one such
resulting class, the shares of each such class then so issuable will be
substantially in the proportion that the total number of shares of each such
class resulting from all such reclassifications bears to the total number of
shares of all such classes resulting from all such reclassifications.

   "Consolidated Net Tangible Assets" means, as of any particular time, the
aggregate amount of assets, less applicable reserves and other properly
deductible items, adjusted for inventories on the basis of cost, before
application of the "last-in first-out" method of determining cost, or current
market value, whichever is lower, and deducting therefrom:

   . all current liabilities except for:

       . notes and loans payable,

       . current maturities of long-term debt, and

       . current maturities of obligations under capital leases; and

   . all goodwill, tradenames, patents, unamortized debt discount and expenses,
     to the extent included in such aggregate amount of assets, and other like
     intangibles, all as set forth on the most recent consolidated balance
     sheet of Alcoa and its consolidated Subsidiaries and computed in
     accordance with generally accepted accounting principles.

                                      16



   "Principal Property" means any manufacturing plant or manufacturing facility
that is:

   . owned by Alcoa or any Restricted Subsidiary; and

   . located within the continental United States of America.

However, any plant that, in the opinion of Alcoa's board of directors, is not
of material importance to the total business conducted by Alcoa and the
Restricted Subsidiaries taken as a whole will not constitute a Principal
Property.

   "Restricted Subsidiary" means any Subsidiary substantially all the property
of which is located within the continental United States, but excluding any
Subsidiary that:

   . is principally engaged in leasing or in financing receivables, or

   . is principally engaged in financing Alcoa's operations outside the
     continental United States, or

   . principally serves as a partner in a partnership.

   "Subsidiary" means any corporation of which at least a majority of the
outstanding stock having the voting power to elect a majority of the board of
directors of such corporation as at the time is owned, directly or indirectly,
by Alcoa or by one or more Subsidiaries, or by Alcoa and one or more
Subsidiaries.

Events of Default

   Unless otherwise provided in the applicable prospectus supplement, the
following are events of default under the indenture with respect to senior debt
securities:

    (a)failure to pay any interest when due, and this failure continues for 30
       days;

    (b)failure to pay any principal or premium when due;

    (c)failure to deposit any sinking fund payment when due and this failure
       continues for 30 days;

    (d)failure to perform any other covenant of Alcoa in the indenture (other
       than a covenant included in the indenture solely for the benefit of a
       series of senior debt securities other than that series), and this
       failure continues for 90 days after written notice as provided in the
       indenture;

    (e)default resulting in acceleration of any indebtedness for money borrowed
       by Alcoa under the terms of the instrument(s) under which such
       indebtedness is issued or secured if such acceleration is not rescinded
       or annulled within 10 days after written notice as provided in the
       indenture, provided that, the resulting event of default under the
       indenture will be cured or waived if such other default is cured or
       waived;

    (f)certain events in bankruptcy, insolvency or reorganization involving
       Alcoa; and

    (g)any other event of default provided with respect to senior debt
       securities of a series. (Section 501)

   If an event of default with respect to senior debt securities occurs and is
continuing, either the trustee or the holders of at least 25% in aggregate
principal amount of the outstanding senior debt securities of that series by
notice as provided in the indenture may declare the principal amount (or, if
the senior debt securities of that series are original issue discount
securities, such portion of the principal amount as may be specified in the
terms of that series) of all the senior debt securities of that series to be
due and payable immediately. At any time after a declaration of acceleration
with respect to senior debt securities of any series has been made, but before
a judgment or decree for payment of money has been obtained by the trustee, the
holders of a majority in aggregate principal amount of the outstanding senior
debt securities of that series may, under certain circumstances, rescind and
annul such acceleration. (Section 502)

   Subject to the duty of the trustee during default to act with the required
standard of care, the trustee will be under no obligation to exercise any of
its rights or powers under the indenture at the request or direction of

                                      17



any of the holders, unless such holders have offered to the trustee reasonable
indemnity. (Sections 601 and 603) The holders of a majority in aggregate
principal amount of the outstanding senior debt securities of any series will
have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the trustee, or exercising any trust or
power conferred on the trustee, with respect to the senior debt securities of
that series. (Section 512)

Conversion and Exchange Rights

   The senior debt securities of any series may be convertible into or
exchangeable for other securities of Alcoa or another issuer on the terms and
subject to the conditions set forth in the applicable prospectus supplement.

Defeasance and Covenant Defeasance

   Unless otherwise indicated in the applicable prospectus supplement with
respect to the senior debt securities of a series, Alcoa, at its option:

    (a)will be discharged from any and all obligations in respect of the senior
       debt securities of that series, except for certain obligations to:

       . issue temporary senior debt securities pending preparation of
         definitive senior debt securities,

       . register the transfer or exchange of senior debt securities of such
         series,

       . replace stolen, lost or mutilated senior debt securities of such
         series, and

       . maintain paying agents and hold moneys for payment in trust,

   or

    (b)need not comply with the covenants that are set forth under "Certain
       Limitations" and "Consolidation, Merger and Sale of Assets," and the
       occurrence of an event described under clause (d) of "Events of Default"
       with respect to any defeased covenant and clauses (e) and (g) of "Events
       of Default" will no longer be events of default,

if, in each case, Alcoa irrevocably deposits with the trustee, in trust, money
and/or U.S. government obligations that through the scheduled payment of
interest thereon and principal thereof in accordance with their terms will
provide money in an amount sufficient to pay all the principal of and any
premium and interest on the senior debt securities of such series on the dates
such payments are due, which may include one or more redemption dates
designated by Alcoa, in accordance with the terms of the indenture and the
senior debt securities. (Sections 1301, 1302, 1303 and 1304) The trust may only
be established if, among other things:

   . no event of default, or event that with the giving of notice or lapse of
     time, or both, would become an event of default, under the indenture has
     occurred and is continuing on the date of such deposit, and no event of
     default, or event that with the giving of notice or lapse of time, or
     both, would become an event of default, under clause (f) of "Events of
     Default" has occurred and is continuing at any time during the period
     ending on the 91st day following such date of deposit, and

   . Alcoa has delivered an opinion of counsel based, in the event of a
     defeasance of the type described in clause (a) above, upon a ruling from
     the Internal Revenue Service or a change in applicable Federal income tax
     law from the date of the indenture, to the effect that the holders of the
     senior debt securities will not recognize income, gain or loss for Federal
     income tax purposes as a result of such deposit or defeasance and will be
     subject to Federal income tax in the same manner as if such defeasance had
     not occurred. (Section 1304)

If Alcoa omits to comply with its remaining obligations under the indenture
after a defeasance of the indenture with respect to the senior debt securities
of any series as described under clause (b) above and the senior debt

                                      18



securities of such series are declared due and payable because of the
occurrence of any undefeased event of default, the amount of money and/or U.S.
government obligations on deposit with the trustee may be insufficient to pay
amounts due on the senior debt securities of such series at the time of the
acceleration resulting from such event of default. However, Alcoa will remain
liable in respect of such payments.

Meetings, Modification and Waiver

   Alcoa and the trustee may make modifications and amendments of the indenture
with the consent of the holders of not less than 66 2/3% in aggregate principal
amount of the outstanding senior debt securities of each series affected by the
modification or amendment. However, Alcoa and the trustee may not make any of
the following modifications or amendments without the consent of the holder of
each outstanding senior debt security affected:

   . change the Stated Maturity of the principal of, or any installment of
     principal of or interest on, any senior debt security;

   . reduce the principal amount of, or premium or interest on, any senior debt
     security;

   . change any obligation of Alcoa to pay additional amounts;

   . reduce the amount of principal of an original issue discount security
     payable upon acceleration of the maturity thereof;

   . change the coin or currency in which any senior debt security or any
     premium or interest thereon is payable;

   . impair the right to institute suit for the enforcement of any payment on
     or with respect to any senior debt security;

   . reduce the percentage in principal amount of outstanding senior debt
     securities of any series, the consent of whose holders is required for
     modification or amendment of the indenture or for waiver of compliance
     with certain provisions of such indenture or for waiver of certain
     defaults;

   . reduce the requirements contained in the indenture for quorum or voting;

   . change any obligation of Alcoa to maintain an office or agency in the
     places and for the purposes required by the indenture; or

   . modify any of the above provisions. (Section 902)

   The holders of at least 66 2/3% of the outstanding senior debt securities of
a series may waive compliance by Alcoa with certain restrictive provisions of
the indenture. (Section 1012) The holders of not less than a majority in
aggregate principal amount of the outstanding senior debt securities of each
series may, on behalf of all holders of senior debt securities of that series
and any coupons appertaining thereto, waive any past default under the
indenture with respect to senior debt securities of that series, except a
default:

   . in the payment of principal of, or any premium or interest on, any senior
     debt security of the series; and

   . in respect of a covenant or provision of the indenture that cannot be
     modified or amended without the consent of the holder of each outstanding
     senior debt security of the series affected. (Section 513)

   In determining whether the holders of the requisite principal amount of the
outstanding senior debt securities have given any request, demand,
authorization, direction, notice, consent or waiver thereunder or are present
at a meeting of holders of senior debt securities for quorum purposes:

   . the principal amount of an original issue discount security that will be
     deemed to be outstanding will be the amount of its principal that would be
     due and payable as of the date of such determination upon acceleration of
     its maturity;

                                      19



   . the principal amount of a senior debt security denominated in a foreign
     currency or currencies will be the U.S. dollar equivalent, determined on
     the date of original issuance of that security, of the principal amount of
     the senior debt security (or, in the case of an original issue discount
     security, the U.S. dollar equivalent, determined on the date of original
     issuance of the senior debt security, of the amount determined as provided
     above); and

   . senior debt securities owned by Alcoa or an affiliate of Alcoa will not be
     deemed outstanding. (Section 101)

   The indenture contains provisions for convening meetings of the holders of
senior debt securities of a series if senior debt securities of that series are
issuable as bearer securities. (Section 1401) A meeting may be called at any
time by the trustee, and also, upon request, by Alcoa or the holders of at
least 10% in principal amount of the outstanding senior debt securities of a
series, in any case upon notice given in accordance with "Notices" below.
(Section 1402) To be entitled to vote at any meeting of holders of senior debt
securities of any series, a person must be:

   . a holder of one or more outstanding senior debt securities of the series;
     or

   . a person appointed by an instrument in writing as proxy of a holder,
     including proxies given to beneficial owners of book-entry securities by
     the depository or its nominee. (Section 1403)

   Except for any consent that must be given by the holder of each outstanding
senior debt security affected thereby, as described above,

   . any resolution presented at a meeting or adjourned meeting at which a
     quorum is present may be adopted by the affirmative vote of the holders of
     a majority in principal amount of the outstanding senior debt securities
     of that series;

   . any resolution with respect to any consent or waiver that may be given by
     the holders of not less than 66 2/3% in principal amount of the
     outstanding senior debt securities of a series may be adopted at a meeting
     or an adjourned meeting at which a quorum is present only by the
     affirmative vote of 66 2/3% in principal amount of the outstanding senior
     debt securities of that series; and

   . any resolution with respect to any request, demand, authorization,
     direction, notice, consent, waiver or other action that may be made, given
     or taken by the holders of a specified percentage, which is less than a
     majority, in principal amount of outstanding senior debt securities of a
     series may be adopted at a meeting or adjourned meeting duly reconvened at
     which a quorum is present by the affirmative vote of the holders of such
     specified percentage in principal amount of the outstanding senior debt
     securities of that series.

Any resolution passed or decision taken at any meeting of holders of senior
debt securities of any series duly held in accordance with the indenture will
be binding on all holders of senior debt securities of that series and the
related coupons.

   The quorum at any meeting called to adopt a resolution, and at any
reconvened meeting, will be persons holding or representing a majority in
principal amount of the outstanding senior debt securities of a series;
provided, however, that if any action is to be taken at such meeting with
respect to a consent or waiver that may be given by the holders of not less
than 66 2/3% in principal amount of the outstanding senior debt securities of a
series, the persons holding or representing 66 2/3% in principal amount of the
outstanding senior debt securities of such series will constitute a quorum.
(Section 1404)

Consolidation, Merger and Sale of Assets

   Alcoa may, without the consent of the holders of any of the outstanding
senior debt securities under the indenture, consolidate or merge with or into,
or transfer or lease its assets substantially as an entirety to, any person
that is a corporation, partnership or trust organized and validly existing
under the laws of any domestic

                                      20



jurisdiction, or may permit any such person to consolidate with or merge into
Alcoa or convey, transfer or lease its properties and assets substantially as
an entirety to Alcoa, provided that:

   . any successor person assumes Alcoa's obligations on the senior debt
     securities and under the indenture;

   . after giving effect to the transaction, no event of default, and no event
     that, after notice or lapse of time, would become an event of default, has
     occurred and is continuing; and

   . certain other conditions are met. (Section 801)

Notices

   Except as otherwise provided in the indenture, notices to holders of bearer
securities will be given by publication at least twice in a daily newspaper in
the City of New York and in such other city or cities as may be specified in
such senior debt securities and described in the applicable prospectus
supplement. Notices to holders of registered securities will be given by mail
to the addresses of such holders as they appear in the security register.
(Sections 101 and 106)

Title

   Title to any bearer securities and any coupons will pass by delivery. Alcoa,
the trustee and any agent of Alcoa or the trustee may treat the bearer of any
bearer security and the bearer of any coupon and the registered owner of any
registered security as the absolute owner thereof, whether or not the senior
debt security or coupon is overdue and notwithstanding any notice to the
contrary, for the purpose of making payment and for all other purposes.
(Section 308)

Replacement of Securities and Coupons

   Alcoa will replace any mutilated senior debt security or a senior debt
security with a mutilated coupon at the expense of the holder upon surrender of
the senior debt security to the security registrar.

   Alcoa will replace senior debt securities or coupons that become destroyed,
stolen or lost at the expense of the holder upon delivery to the trustee of the
senior debt security and coupons or evidence of the destruction, loss or theft
thereof satisfactory to Alcoa and the trustee. If any coupon becomes destroyed,
stolen or lost, that coupon will be replaced by issuance of a new senior debt
security in exchange for the senior debt security to which that coupon is
attached. In the case of a destroyed, lost or stolen senior debt security or
coupon, an indemnity satisfactory to the trustee and Alcoa may be required at
the expense of the holder of such senior debt security or coupon before a
replacement senior debt security will be issued. (Section 306)

Governing Law

   The indenture, the senior debt securities and the coupons will be governed
by, and construed in accordance with, the laws of the Commonwealth of
Pennsylvania, except to the extent that the Trust Indenture Act applies.
(Section 113)

Regarding the Trustee

   J.P. Morgan Trust Company, N.A. is the trustee under the indenture. Alcoa
and certain of its subsidiaries maintain deposit accounts and conduct other
banking transactions, including borrowings in the ordinary course of business,
with J.P. Morgan Trust Company, N.A. or its affiliates.

                                      21



                  DESCRIPTION OF SUBORDINATED DEBT SECURITIES

   The following description sets forth certain general terms and provisions of
the subordinated debt securities that Alcoa may offer. The particular terms of
the subordinated debt securities and the extent, if any, to which the general
provisions may apply to the subordinated debt securities will be described in
the related prospectus supplement.

   The subordinated debt securities may be issued under an indenture between
Alcoa and J.P. Morgan Trust Company, N.A., as trustee, or such other trustee
that is named in a prospectus supplement. The form of the indenture has been
filed with the SEC as an exhibit to the registration statement of which this
prospectus is a part. The following summary of certain provisions of the
indenture and the subordinated debt securities is not meant to be complete. For
more information, you should refer to the full text of the indenture and the
subordinated debt securities, including the definitions of terms used and not
defined in this prospectus or the related prospectus supplement.

General

   The subordinated debt securities will be unsecured and will rank junior and
be subordinate in right of payment to all Senior Debt (as defined below) of
Alcoa. The indenture does not limit the incurrence or issuance of other secured
or unsecured debt of Alcoa, whether under the indenture or any existing or
other indenture that Alcoa may enter into in the future or otherwise. See
"Subordination."

   The subordinated debt securities will not be subject to any sinking fund
provision.

   A prospectus supplement will describe the following terms of the
subordinated debt securities Alcoa may offer:

   . the specific designation, aggregate principal amount and purchase price;

   . any limit on the aggregate principal amount;

   . the date(s) on which the principal is payable and any right to extend such
     date(s);

   . any rate(s) at which the subordinated debt securities will bear interest
     or the method of calculating any interest rate(s);

   . the date(s) from which interest will accrue, the interest payment dates on
     which interest will be payable or the manner of determination of interest
     payment dates and the record dates for the determination of holders to
     whom interest is payable on any interest payment dates;

   . any right to defer payments of interest by extending the interest payment
     periods and the duration of such extensions;

   . the period(s) within which, the price(s) at which, and the terms and
     conditions upon which, the subordinated debt securities may be redeemed,
     in whole or in part, at the option of Alcoa;

   . any obligation of Alcoa to redeem or purchase the subordinated debt
     securities at the option of the holder thereof and the period(s) within
     which, the price(s) at which, and the terms and conditions upon which, the
     subordinated debt securities will be redeemed or purchased, in whole or
     part, under such obligation;

   . any applicable United States Federal income tax consequences, including
     whether and under what circumstances Alcoa will pay additional amounts on
     the subordinated debt securities held by a person who is not a U.S. person
     in respect of any tax, assessment or governmental charge withheld or
     deducted and, if so, whether Alcoa will have the option to redeem the
     subordinated debt securities rather than pay such additional amounts;

   . the form of the subordinated debt securities;

                                      22



   . if other than denominations of $1,000 or any integral multiple thereof,
     the denominations in which the subordinated debt securities will be
     issuable;

   . any and all other terms, including any modifications of or additions to
     the events of default or covenants, and any terms that may be required by
     or advisable under applicable laws or regulations not inconsistent with
     the indenture;

   . the terms and conditions upon which the subordinated debt securities may
     be convertible into or exchanged for other securities of Alcoa or another
     issuer; and

   . whether the subordinated debt securities are issuable as a global
     security, and in such case, the identity of the depository.

   Unless otherwise indicated in the applicable prospectus supplement, the
subordinated debt securities will be issued in United States dollars in fully
registered form without coupons. No service charge will be made for any
transfer or exchange of any subordinated debt securities, but Alcoa may require
payment of a sum sufficient to cover any tax or other governmental charge
payable in connection with a transfer or exchange.

   Subordinated debt securities may also be issued under the indenture upon the
exercise of warrants, in connection with a stock purchase contract or as part
of a stock purchase unit. See "Description of Warrants" and "Description of
Stock Purchase Contracts and Stock Purchase Units."

Global Securities

   If any subordinated debt securities are represented by one or more global
securities, the applicable prospectus supplement will describe any
circumstances under which beneficial owners of interests in any global security
may exchange those interests for subordinated debt securities of like tenor and
principal amount in any authorized form and denomination. Principal of, and any
premium and interest on, a global security will be payable in the manner
described in the applicable prospectus supplement.

   The specific terms of the depositary arrangement regarding any portion of
subordinated debt securities to be represented by a global security will be
described in the applicable prospectus supplement.

Payment and Paying Agents

   Payments on subordinated debt securities represented by a global security
will be made to the depository for the subordinated debt securities. If
subordinated debt securities are issued in definitive form, then the following
will take place at the corporate office of the trustee in Pittsburgh,
Pennsylvania or at the office of such paying agent(s) as Alcoa may designate:

   . payment of principal of and any premium and interest on the subordinated
     debt securities;

   . registration of the transfer of the subordinated debt securities; and

   . the exchange of the subordinated debt securities into subordinated debt
     securities of other denominations of a like aggregate principal amount.

However, at the option of Alcoa, payment of any interest may be made:

   . by check mailed to the address of the person entitled thereto as such
     address appears in the securities register; or

   . by wire transfer to an account maintained by the person entitled thereto
     as specified in the securities register, provided that proper transfer
     instructions have been received by the regular record date.

                                      23



Payment of any interest on subordinated debt securities will be made to the
person in whose name the subordinated debt securities are registered at the
close of business on the regular record date for the interest, except in the
case of defaulted interest. Unless otherwise set forth in the applicable
prospectus supplement, the regular record date for the interest payable on any
interest payment date will be the 15th day, whether or not a business day, next
preceding such interest payment date. Alcoa may at any time designate
additional paying agents or rescind the designation of any paying agent.
(Section 2.3)

   Any monies deposited with the trustee or any paying agent or then held by
Alcoa in trust for the payment of the principal of and any premium or interest
on any subordinated debt securities and remaining unclaimed for two years after
such principal and premium, if any, or interest has become due and payable
will, at the request of Alcoa, be repaid to Alcoa. Thereafter, the holder of
such subordinated debt securities may look, as a general unsecured creditor,
only to Alcoa for payment. (Section 10.3)

Modification of Indenture

   Alcoa and the trustee may, without the consent of the holders of
subordinated debt securities, amend, waive or supplement the indenture for
specified purposes, including, among other things:

   . curing ambiguities, defects or inconsistencies, provided that any such
     action does not materially adversely affect the interest of the holders of
     the subordinated debt securities; and

   . qualifying, or maintaining the qualification of, the indenture under the
     Trust Indenture Act. (Section 9.1)

   Alcoa and the trustee may, with the consent of the holders of not less than
a majority in principal amount of the outstanding subordinated debt securities,
modify the indenture in a manner affecting the rights of the holders of the
subordinated debt securities. However, no such modification may, without the
consent of the holder of each outstanding subordinated debt security so
affected:

   . change the stated maturity of the subordinated debt securities;

   . reduce the principal amount thereof;

   . reduce the rate or extend the time of payment of interest thereon, other
     than deferrals of the payments of interest during any extension period as
     described in any applicable prospectus supplement;

   . reduce the premium payable upon redemption;

   . impair any right to institute suit for the enforcement of any such payment;

   . adversely affect the subordination provisions of the indenture or any
     right to convert or exchange any subordinated debt securities; or

   . reduce the percentage of principal amount of subordinated debt securities,
     the holders of which are required to consent to any such modification of
     the indenture. (Section 9.2)

Events of Default

   Any one or more of the following described events that has occurred and is
continuing constitutes an event of default with respect to the subordinated
debt securities:

    (a)failure for 30 days to pay any interest when due (subject to the
       deferral of any due date in the case of an extension period);

    (b)failure to pay any principal or premium when due whether at maturity,
       upon redemption, by declaration or otherwise;

    (c)failure by Alcoa to deliver securities upon an appropriate election by
       holders of subordinated debt securities to convert their subordinated
       debt securities into those securities;

                                      24



    (d)failure to observe or perform certain other covenants contained in the
       indenture for 90 days after written notice to Alcoa from the trustee or
       to the trustee and Alcoa from the holders of at least 25% in aggregate
       outstanding principal amount of the subordinated debt securities; or

    (e)certain events in bankruptcy, insolvency or reorganization of Alcoa.
       (Section 5.1)

   The holders of a majority in aggregate outstanding principal amount of the
subordinated debt securities of any series will have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the trustee or exercising any trust or power conferred on the trustee
consistent with the indenture with respect to the subordinated debt securities
of that series. (Section 5.12) If an event of default with respect to
subordinated debt securities occurs and is continuing, either the trustee or
the holders of not less than 25% in aggregate principal amount of the
outstanding subordinated debt securities of that series may declare the
principal of all of the subordinated debt securities of that series due and
payable immediately. At any time after a declaration of acceleration with
respect to subordinated debt securities of any series has been made, but before
a judgment or decree for payment of money has been obtained by the trustee, the
holders of a majority in aggregate outstanding principal amount of the
subordinated debt securities of that series may annul and rescind such
declaration if the default, other than the non-payment of the principal of the
subordinated debt securities which has become due solely by such acceleration,
has been cured or waived, and a sum sufficient to pay all matured installments
of interest and principal due, otherwise than by acceleration, has been
deposited with the trustee. (Section 5.2)

   The holders of a majority in aggregate outstanding principal amount of the
subordinated debt securities of any series may, on behalf of the holders of all
the subordinated debt securities of that series, waive any past default under
the indenture with respect to that series. However, they may not waive:

   . a default in the payment of principal or interest, unless such default has
     been cured and a sum sufficient to pay all matured installments of
     interest and principal due otherwise than by acceleration has been
     deposited with the trustee; or

   . a default in respect of a covenant or provision that under the indenture
     cannot be modified or amended without the consent of the holder of each
     outstanding subordinated debt security. (Section 5.13)

Alcoa is required to file annually with the trustee a certificate as to whether
or not Alcoa is in compliance with all the conditions and covenants applicable
to it under the indenture. (Section 10.5)

Consolidation, Merger, Sale of Assets and Other Transactions

   Alcoa may not consolidate with or merge into any other person or convey,
transfer or lease its properties and assets substantially as an entirety to any
person, and no person may consolidate with or merge into Alcoa or convey,
transfer or lease its properties and assets substantially as an entirety to
Alcoa, unless:

   . if Alcoa consolidates with or merges into another person or conveys,
     transfers or leases its properties and assets substantially as an entirety
     to any person, the successor person is organized under the laws of the
     United States or any state or the District of Columbia, and such successor
     person expressly assumes Alcoa's obligations on the subordinated debt
     securities and under the indenture;

   . immediately after giving effect thereto, no event of default, and no event
     that, after notice or lapse of time or both, would become an event of
     default, has happened and is continuing; and

   . certain other conditions as prescribed in the indenture are met. (Section
     8.1)

Highly Leveraged Transactions

   The general provisions of the indenture do not afford holders of the
subordinated debt securities protection in the event of a highly leveraged or
other transaction involving Alcoa that may adversely affect holders of the
subordinated debt securities.

                                      25



Satisfaction and Discharge

   The indenture will cease to be of further effect, and Alcoa will be deemed
to have satisfied and discharged the indenture, when, among other things:

   . all subordinated debt securities not previously delivered to the trustee
     for cancellation have become due and payable or will become due and
     payable at their stated maturity within one year or are to be properly
     called for redemption within one year; and

   . Alcoa irrevocably deposits or causes to be deposited with the trustee as
     trust funds money and/or U.S. government obligations sufficient to pay and
     discharge the entire indebtedness on the subordinated debt securities for
     the principal and any premium, interest and other sums payable under the
     indenture on the dates such payments are due. (Section 4.1)

Subordination

   Any subordinated debt securities issued under the indenture will be
subordinate and junior in right of payment to all Senior Debt (as defined
below) of Alcoa whether existing at the date of the indenture or subsequently
incurred. Upon any payment or distribution of assets of Alcoa to creditors upon
any:

   . liquidation;

   . dissolution;

   . winding-up;

   . reorganization;

   . assignment for the benefit of creditors;

   . marshaling of assets or any bankruptcy;

   . insolvency; or

   . debt restructuring or similar proceedings in connection with any
     insolvency or bankruptcy proceeding of Alcoa,

the holders of Senior Debt will first be entitled to receive payment in full of
principal of and any premium and interest on such Senior Debt before the
holders of the subordinated debt securities will be entitled to receive or
retain any payment in respect of the principal of and any premium or interest
on the subordinated debt securities. (Sections 12.1 and 12.2)

   Upon the acceleration of the maturity of any subordinated debt securities,
the holders of all Senior Debt outstanding at the time of such acceleration
will first be entitled to receive payment in full of all amounts due thereon,
including any amounts due upon acceleration, before the holders of subordinated
debt securities will be entitled to receive or retain any payment in respect of
the principal of or any premium or interest on the subordinated debt
securities. (Section 12.1)

   No payments on account of principal, or any premium or interest, in respect
of the subordinated debt securities may be made if:

   . there has occurred and is continuing a default in any payment with respect
     to Senior Debt;

   . there has occurred and is continuing an event of default with respect to
     any Senior Debt resulting in the acceleration of the maturity thereof; or

   . any judicial proceeding is pending with respect to any such default or
     event of default with respect to any Senior Debt. (Section 12.3)

                                      26



   "Debt" means, with respect to any person, whether recourse is to all or a
portion of the assets of such person and whether or not contingent:

   . every obligation of such person for money borrowed;

   . every obligation of such person evidenced by bonds, debentures, notes or
     other similar instruments, including obligations incurred in connection
     with the acquisition of property, assets or businesses;

   . every reimbursement obligation of such person with respect to letters of
     credit, bankers' acceptances or similar facilities issued for the account
     of such person;

   . every obligation of such person issued or assumed as the deferred purchase
     price of property or services, but excluding trade accounts payable or
     accrued liabilities arising in the ordinary course of business;

   . every capital lease obligation of such person; and

   . every obligation of the type referred to above of another person and all
     dividends of another person the payment of which, in either case, such
     person has guaranteed or for which such person is responsible or liable,
     directly or indirectly, as obligor or otherwise.

   "Senior Debt" means the principal of, and any premium and interest,
including interest accruing on or after the filing of any petition in
bankruptcy or for reorganization relating to Alcoa, whether or not such claim
for post-petition interest is allowed in such proceeding, on Debt of Alcoa,
whether incurred on, before or after the date of the indenture, unless the
instrument creating or evidencing the Debt or under which the Debt is
outstanding provides that obligations created by it are not superior in right
of payment to the subordinated debt securities.

   The indenture will place no limitation on the amount of additional Senior
Debt that may be incurred by Alcoa.

Governing Law

   The indenture and the subordinated debt securities will be governed by and
construed in accordance with the laws of the State of New York, except to the
extent that the Trust Indenture Act applies. (Section 1.12)

Information Concerning the Trustee

   J.P. Morgan Trust Company, N.A. will be the trustee under the indenture. The
trustee is not obligated to exercise any of its powers under the indenture at
the request of any holder of subordinated debt securities, unless the holder
offers to indemnify the trustee against any loss, liability or expense, and
then only to the extent required by the terms of the indenture. The trustee is
not required to expend or risk its own funds or otherwise incur personal
financial liability in the performance of its duties if the trustee reasonably
believes that repayment or adequate indemnity is not reasonably assured to it.
(Section 6.3) Alcoa and certain of its subsidiaries maintain deposit accounts
and conduct other banking transactions, including borrowings in the ordinary
course of business, with J.P. Morgan Trust Company, N.A. or its affiliates.

Additional Provisions that may be Applicable to Subordinated Debt Securities

   Alcoa may issue a specific series of subordinated debt securities in
connection with the issuance by the Alcoa Trust of trust preferred securities.
See "Description of Trust Preferred Securities and Trust Guarantee" below. At
the time the Alcoa Trust issues trust preferred securities, it will invest the
proceeds from the issuance of such securities, together with the consideration
paid by Alcoa for the related trust common securities, in subordinated debt
securities. The subordinated debt securities held by the Alcoa Trust will be in
the principal amount equal to the aggregate stated liquidation amount of the
trust preferred securities plus Alcoa's concurrent investment in the related
trust common securities.

                                      27



   So long as any of the trust preferred securities remain outstanding:

   . no modification may be made to the indenture relating to the subordinated
     debt securities that adversely affects the holders of the trust preferred
     securities in any material respect;

   . no termination of the indenture may occur, and no waiver of any event of
     default with respect to the subordinated debt securities or compliance
     with any covenant under the indenture may be effective, without the prior
     consent of the holders of at least a majority in aggregate liquidation
     amount of the trust preferred securities then outstanding unless and until
     the principal of and any premium on the subordinated debt securities and
     all accrued and unpaid interest thereon has been paid in full; and

   . where a consent under the indenture would require the consent of each
     holder of subordinated debt securities, no such consent will be given by
     the Property Trustee without the prior consent of each holder of the trust
     preferred securities. (Sections 9.1 and 9.2)

   If an event of default occurs and is continuing, the Property Trustee will
have the right to declare the principal of and the interest on the subordinated
debt securities and any other amounts payable under the indenture to be due and
payable and to enforce its other rights as a creditor with respect to the
subordinated debt securities. (Section 5.2)

   Upon the occurrence and continuance of an event of default under the
indenture:

   . the holders of at least 25% in aggregate liquidation amount of the trust
     preferred securities then outstanding will have the right to declare the
     principal of all the subordinated debt securities to be immediately due
     and payable if the trustee or the holders of not less than 25% in
     principal amount of the outstanding subordinated debt securities fail to
     make such declaration; and

   . the holders of a majority in aggregate liquidation amount of the trust
     preferred securities then outstanding will have the right to annul and
     rescind such declaration if the holders of a majority in principal amount
     of the outstanding subordinated debt securities fail to annul and rescind
     such declaration as provided in the indenture. (Section 5.2)

   The holders of a majority in aggregate liquidation amount of the trust
preferred securities then outstanding will have the right to waive any past
default under the indenture if the holders of a majority in principal amount of
the outstanding subordinated debt securities fail to waive such past default as
provided in the indenture. (Section 5.13)

   Any consolidation, merger, conveyance, transfer or lease of Alcoa's
properties and assets substantially as an entirety permitted under the
indenture must also be permitted under the trust agreement and the trust
guarantee relating to the trust preferred securities. (Section 8.1)

   Under the indenture, Alcoa will pay all of the costs, expenses or
liabilities of the Alcoa Trust, other than obligations of the Alcoa Trust to
pay to the holders of any trust preferred securities or trust common securities
the amounts due under the terms of those securities. (Section 10.9)

                                      28



                        DESCRIPTION OF PREFERRED STOCK

   Alcoa's Articles of Incorporation, as amended, authorize Alcoa to issue two
classes of preferred stock:

   . 660,000 shares of $3.75 Cumulative Preferred Stock, par value $100.00 per
     share ("Class A Stock"); and

   . 10,000,000 shares of Class B Serial Preferred Stock, par value $1.00 per
     share ("Class B Stock").

As of November 30, 2001, Alcoa had 557,649 shares of Class A Stock outstanding
and no shares of Class B Stock outstanding. No additional shares of Class A
Stock may be issued. Alcoa initiated an ongoing program to purchase and retire
shares of Class A Stock in 1989.

   The following is a description of certain general terms and provisions of
the series of Class B Stock. The specific terms of a particular series of Class
B Stock will be described in the related prospectus supplement. The terms of
any series of Class B Stock as set forth in a prospectus supplement may differ
from the terms set forth below. The following description of Class B Stock and
the description of the terms of a particular series of Class B Stock set forth
in the applicable prospectus supplement are not meant to be complete. For more
information, you should refer to Alcoa's Articles of Incorporation and
Statement with Respect to Shares relating to such series of Class B Stock,
which will be filed or incorporated by reference as an exhibit to the
registration statement of which this prospectus is a part.

General

   The board of directors of Alcoa may issue shares of Class B Stock in one or
more series and may fix the specific number of shares and, subject to Alcoa's
Articles of Incorporation, the relative rights and preferences of any such
series so established. All shares of preferred stock must be identical, except
with respect to the following relative rights and preferences, any of which may
vary between different series:

   . the rate of dividend, including the date from which dividends will be
     cumulative, whether such dividend rate will be fixed or variable and the
     methods, procedures and formulas for the recalculation or periodic
     resetting of any variable dividend rate;

   . the price at, and the terms and conditions on, which shares may be
     redeemed;

   . the amounts payable on shares in the event of voluntary or involuntary
     liquidation;

   . sinking fund provisions for the redemption or purchase of shares in the
     event shares of any series of preferred stock are issued with sinking fund
     provisions; and

   . the terms and conditions on which the shares of any series may be
     converted in the event the shares of any series are convertible.

   Each share of any series of Class B Stock will be identical with all other
shares of the same series, except as to the date from which dividends will be
cumulative.

   The prospectus supplement will set forth the following specific terms
regarding the series of Class B Stock it offers:

   . the designation, number of shares and liquidation preference per share;

   . the initial public offering price;

   . the dividend rate(s), or the method of determining the dividend rate(s);

   . any index upon which the amount of any dividends is determined;

   . the dates on which any dividends will accrue and be payable, whether
     dividends will be cumulative, and the designated record dates for
     determining the holders entitled to dividends;

                                      29



   . any redemption or sinking fund provisions;

   . any conversion or exchange provisions;

   . provisions for issuance of global securities;

   . the currency, which may be a composite currency, in which payment of any
     dividends will be payable if other than United States dollars;

   . any voting rights, except as otherwise required by law; and

   . any additional terms, preferences or rights and qualifications,
     limitations or restrictions.

   The shares of Class B Stock will, when issued, be fully paid and
nonassessable and will have no preemptive rights.

   The transfer agent, registrar, dividend disbursing agent and redemption
agent for the Class B Stock will be specified in the related prospectus
supplement.

Dividends

   The holders of Class A Stock are entitled to receive, when and as declared
by Alcoa's board of directors, out of legally available funds, cumulative cash
dividends at the annual rate of $3.75 per share, payable quarterly on the first
day of January, April, July and October in each year.

   The holders of the Class B Stock of each series will be entitled to receive,
when, as and if declared by Alcoa's board of directors, out of legally
available funds, cumulative cash or other dividends at such rate(s) and on such
dates as the board of directors determines. The applicable prospectus
supplement will set forth this dividend right. Rates may be fixed or variable
or both. The board may not declare dividends in respect of any dividend period
on any series of Class B Stock unless all accrued dividends and the current
quarter yearly dividend on the Class A Stock are paid in full or the board
contemporaneously declares and sets apart such Class A Stock dividends. If
Alcoa has not declared and paid or set apart the full cumulative dividends on
shares of a series of Class B Stock, dividends thereon will be declared and
paid pro rata to the holders of the series. Alcoa will not pay interest on any
dividend payment on the Class A Stock or the Class B Stock which is in arrears.

   If Alcoa has not declared and paid or set apart when due full cumulative
dividends on any class or series of Class A Stock or Class B Stock, including
the current quarter yearly dividend for shares of Class A Stock, Alcoa may not
declare or pay any dividends on, or make other distributions on or make payment
on account of the purchase, redemption, or other retirement, of Alcoa common
stock. No restriction applies to Alcoa's repurchase or redemption of Class A
Stock or Class B Stock while there is any arrearage in the payment of dividends
or any applicable sinking fund installments on Class A Stock or Class B Stock.

Redemption

   Alcoa may redeem all or any part of the Class A Stock at any time at the
option of its board of directors. Such redemption will be at par, plus accrued
dividends. Alcoa must publish notice of such redemption in daily newspapers of
general circulation in New York City and in Pittsburgh, Pennsylvania, as well
as by mail to each record holder. Alcoa must give such notice not less than 30
days nor more than 60 days before the date fixed for redemption. If Alcoa
redeems only part of the Class A Stock, Alcoa will select the shares to be
redeemed pro rata or by lot, as Alcoa's board of directors determines.

   If notice of redemption has been given, from and after the redemption date
for the shares of Class A Stock called for redemption, the following will
occur, unless Alcoa fails to provide funds for payment of the redemption price:

   . dividends on the shares of Class A Stock called for redemption will cease
     to accrue;

                                      30



   . such shares will no longer be deemed to be outstanding; and

   . holders will have no further rights as shareholders of Alcoa, except the
     right to receive the redemption price.

   Holders will receive the redemption price for the Class A Stock when they
surrender the certificates representing such shares in accordance with the
redemption notice (including being properly endorsed or assigned for transfer,
if Alcoa's board of directors so requires and the notice so states). If Alcoa
redeems fewer than all of the shares represented by any certificate, Alcoa will
issue a new certificate representing the unredeemed shares, at no cost to the
certificate holder. All shares of Class A Stock which Alcoa redeems will be
cancelled and not reissued.

   The terms and conditions under which all or any part of any series of the
Class B Stock may be redeemed will be established by Alcoa's board of directors
before Alcoa issues such series of Class B Stock. Unless Alcoa's board of
directors determines otherwise, all shares of Class B Stock which Alcoa redeems
or otherwise acquires will return to the status of authorized but unissued
shares.

Liquidation Preference

   Upon any liquidation, dissolution or winding up of Alcoa, each holder of
Class A Stock will be entitled to receive, out of the assets of Alcoa available
for distribution to shareholders, $100 per share plus accrued and unpaid
dividends, before any distribution of assets is made to or set apart for the
holders of Class B Stock or common stock.

   Upon any liquidation, dissolution or winding up of Alcoa, the holders of
shares of each series of Class B Stock will be entitled to receive, out of the
assets of Alcoa available for distribution to shareholders, an amount fixed by
the board of directors plus any accrued and unpaid dividends, before any
distribution is made or set apart for holders of common stock, as described in
the prospectus supplement relating to the series of Class B Stock. If Alcoa's
assets are insufficient to pay the full amount payable on shares of each series
of Class B Stock in any case of liquidation, dissolution or winding up of
Alcoa, the holders of shares of the series of Class B Stock will share ratably
in any such distribution of assets of Alcoa in proportion to the full
respective preferential amounts to which they are entitled. Once holders of
shares of the series of Class B Stock are paid the full preferential amounts to
which they are entitled, they will not be entitled to participate any further
in any distribution of assets by Alcoa, unless indicated otherwise in the
applicable prospectus supplement. A consolidation or merger of Alcoa with one
or more corporations will not be deemed to be a liquidation, dissolution or
winding up of Alcoa.

Conversion and Exchange Rights

   Class A Stock is not convertible or exchangeable for common stock. Any terms
on which shares of any series of Class B Stock are convertible into or
exchangeable for common stock will be set forth in the related prospectus
supplement. These terms may include provisions for conversion or exchange,
either mandatory, at the option of the holder, or at the option of Alcoa.

Voting Rights

   Except as indicated below or in the related prospectus supplement for a
particular series of the Class B Stock, or except as expressly required by
applicable law, the holders of Class A Stock and Class B Stock will not be
entitled to vote.

   Pennsylvania law requires that holders of outstanding shares of a particular
class or series of stock be entitled to vote as a class on an amendment to the
Articles of Incorporation that would do any of the following:

   . authorize Alcoa's board of directors to fix and determine the relative
     rights and preferences as between any series of any preferred stock or
     special class of stock;

                                      31



   . change the preferences, limitations or other special rights of the shares
     of a class or series in a manner which is adverse to that class or series;

   . authorize a new class or series of shares which has a preference as to
     dividends or assets which is senior to that of shares of a particular
     class or series; or

   . increase the number of authorized shares of any particular class or series
     which has a preference as to dividends or assets which is senior in any
     respect to the shares of such class or series.

   The board of directors, under Alcoa's Articles of Incorporation, may limit
or eliminate the voting rights applicable to any series of Class B Stock before
the issuance of such series, except as otherwise required by law. Any one or
more series of the Class B Stock may be issued with such additional voting
rights, which will be exercisable only during extended periods of dividend
arrearages, as the board of directors may determine in order to qualify such
series for listing on a recognized stock exchange. Such rights may only be
granted if there are no shares of Class A Stock outstanding.

   Each full share of any series of the Class B Stock will be entitled to one
vote on matters on which holders of such series, together with holders of any
other series of Class B Stock, are entitled to vote as a single class.
Therefore, the voting power of each series will depend on the number of shares
in that series, and not on the liquidation preference or initial offering price
of such shares.

   Alcoa must obtain the consent of the holders of at least a majority of the
outstanding Class A Stock and Class B Stock, voting as a class, to do the
following:

   . authorize any additional class of stock or increase the authorized number
     of shares of preferred stock or any class of stock which ranks on a parity
     with the Class A Stock or Class B Stock as to dividends or assets; or

   . merge or consolidate with or into any other corporation if the corporation
     surviving or resulting from such merger or consolidation would have any
     authorized class of stock ranking senior to or on a parity with the Class
     A Stock or Class B Stock, except the same number of shares of stock with
     the same rights and preferences as the authorized stock of the corporation
     immediately before such merger or consolidation.

   So long as any shares of Class A Stock or Class B Stock remain outstanding,
Alcoa may not, without the consent of the holders of at least two-thirds of the
outstanding Class A Stock and Class B Stock, voting as a class:

   . make any adverse change in the rights and preferences of the Class A Stock
     or Class B Stock. If such a change would affect any series of Class A
     Stock or Class B Stock adversely as compared to the effect on any other
     series of Class A Stock or Class B Stock, no such change may be made
     without the additional consent of the holders of at least two-thirds of
     the outstanding shares of such series of Class A Stock or Class B Stock;

   . authorize any additional class of stock or increase the authorized number
     of shares of any class of stock which ranks senior to the Class A Stock or
     Class B Stock as to dividends or assets; or

   . sell or otherwise part with control of all or substantially all of its
     property or business or voluntarily liquidate, dissolve or wind up its
     affairs.

                                      32



                          DESCRIPTION OF COMMON STOCK

   Alcoa is authorized to issue 1,800,000,000 shares of common stock, par value
$1.00 per share. As of November 30, 2001, there were 848,394,799 shares of
Alcoa common stock outstanding. In addition, as of the same date, there were
76,179,739 shares of Alcoa common stock issued and held in Alcoa's treasury,
and 84,255,699 shares of Alcoa common stock reserved for issuance under various
incentive plans.

Dividend Rights

   Holders of Alcoa common stock are entitled to receive dividends as declared
by the Alcoa board of directors. However, no dividend will be declared or paid
on Alcoa's common stock until Alcoa has paid (or declared and set aside funds
for payment of) all dividends which have accrued on all classes of Alcoa's
preferred stock, including the current quarter yearly dividend on the Class A
Stock.

Voting Rights

   Holders of Alcoa common stock are entitled to one vote per share.

Liquidation Rights

   Upon any liquidation, dissolution or winding up of Alcoa, whether voluntary
or involuntary, after payments to holders of preferred stock of amounts
determined by the board of directors, plus any accrued dividends, Alcoa's
remaining assets will be divided among holders of Alcoa common stock. Under
Alcoa's Articles of Incorporation, neither the consolidation or merger of Alcoa
with or into one or more corporations or any share exchange or division
involving Alcoa will be deemed a liquidation, dissolution or winding up of
Alcoa.

Preemptive or Other Subscription Rights

   Holders of Alcoa common stock will not have any preemptive right to
subscribe for any securities of Alcoa.

Conversion and Other Rights

   No conversion, redemption or sinking fund provisions apply to Alcoa common
stock, and Alcoa common stock is not liable to further call or assessment by
Alcoa. All issued and outstanding shares of Alcoa common stock are fully paid
and non-assessable.

Other Matters

   Alcoa's Articles of Incorporation provide for the following:

   . a classified board of directors with staggered three-year terms;

   . special shareholder voting requirements to remove directors; and

   . certain procedures relating to the nomination of directors, filling of
     vacancies and the vote required to amend or repeal any of these provisions.

   Alcoa's Articles of Incorporation also prohibit Alcoa's payment of
"green-mail," that is, payment of a premium in purchasing shares of its common
stock from a present or recent holder of 5% or more of the common stock, except
with the approval of a majority of the disinterested shareholders. This
provision and the classified board provision may be amended or repealed only
with the affirmative vote of at least 80% of the common stock. In addition, the
Articles of Incorporation limit or eliminate to the fullest extent permitted by
Pennsylvania law, as

                                      33



from time to time in effect, the personal liability of Alcoa's directors for
monetary damages, and authorize Alcoa, except as prohibited by law, to
indemnify directors, officers, employees and others against liabilities and
expenses incurred by them in connection with the performance of their duties to
Alcoa. The classified board article provision and the anti-"greenmail"
provision may have certain anti-takeover effects.

   Alcoa is governed by certain "anti-takeover" provisions in the Pennsylvania
Business Corporation Law (the "PCBL"). Chapter 25 of the PBCL contains several
anti-takeover provisions that apply to registered corporations such as Alcoa.
Section 2538 of the PBCL requires shareholder approval for certain transactions
between a registered corporation and an interested shareholder (generally, a
shareholder who owns 20% of the stock entitled to vote in an election of
directors). Section 2538 applies if an interested shareholder (together with
anyone acting jointly with such shareholder and any affiliates of such
shareholder):

   . is to be a party to a merger or consolidation, a share exchange or certain
     sales of assets involving such corporation or one of its subsidiaries;

   . is to receive a disproportionate amount of any of the securities of any
     corporation which survives or results from a division of the corporation;

   . is to be treated differently from others holding shares of the same class
     in a voluntary dissolution of such corporation; or

   . is to have his or her percentage of voting or economic share interest in
     such corporation materially increased relative to substantially all other
     shareholders in a reclassification.

   In such a case, the proposed transaction must be approved by the affirmative
vote of the holders of shares representing at least a majority of the votes
that all shareholders are entitled to cast with respect to such transaction.
Shares held by the interested shareholder are not included in calculating the
number of shares entitled to be cast, and the interested shareholder is not
entitled to vote on the transaction. This special voting requirement does not
apply if the proposed transaction has been approved in a prescribed manner by
the corporation's board of directors or if certain other conditions, including
the amount of consideration to be paid to certain shareholders, are satisfied
or the transaction involves certain subsidiaries.

   Section 2555 of the PBCL may also apply to a transaction between a
registered corporation and an interested shareholder, even if Section 2538 also
applies. Section 2555 prohibits a corporation from engaging in a business
combination with an interested shareholder unless one of the following
conditions is met:

   . the board of directors has previously approved either the proposed
     transaction or the interested shareholder's acquisition of shares;

   . the interested shareholder owns at least 80% of the stock entitled to vote
     in an election of directors and, no earlier than three months after the
     interested shareholder reaches the 80% level,

       . the majority of the remaining shareholders approve the proposed
         transaction;

       . shareholders receive a minimum "fair price" for their shares in the
         transaction; and

       . the other conditions of Section 2556 of the PBCL are met;

   . holders of all outstanding common stock approve the transaction;

   . no earlier than 5 years after the interested shareholder acquired the 20%,
     a majority of the remaining shares entitled to vote in an election of
     directors approve the transaction; or

   . no earlier than 5 years after the interested shareholder acquired the 20%,
     a majority of all the shares approve the transaction, all shareholders
     receive a minimum fair price for their shares, and certain other
     conditions are met.


                                      34



   Alcoa's Articles of Incorporation also provide that Alcoa may not repurchase
any stock from an interested shareholder at prices greater than the current
fair market value. Under the PBCL, a person or group of persons acting in
concert who hold 20% of the shares of a registered corporation entitled to vote
in the election of directors constitutes a control group. On the occurrence of
the transaction that makes the group a control group, any other shareholder of
the registered corporation who objects can, under procedures set forth under
the PBCL, require the control group to purchase his or her shares at "fair
value," as defined in the PBCL.

   The PBCL also contains certain provisions applicable to a registered
corporation such as Alcoa which, under certain circumstances, permit a
corporation to:

   . redeem "control shares," as defined in the PBCL;

   . remove the voting rights of control shares; and

   . require the disgorgement of profits by a "controlling person," as defined
     in the PBCL.

   The transfer agent and registrar for Alcoa common stock is First Chicago
Trust Company, a Division of EquiServe.

                            DESCRIPTION OF WARRANTS

General

   Alcoa may issue warrants for the purchase of debt securities, preferred
stock or common stock. Alcoa may issue such warrants independently or together
with other securities offered by any prospectus supplement. Alcoa will issue
each series of warrants under a separate warrant agreement to be entered into
between itself and a bank or trust company, as warrant agent, that it will name
in the prospectus supplement. The warrant agent will act solely as Alcoa's
agent in connection with the warrants and will not have any obligation or
relationship of agency or trust for or with any holders or beneficial owners of
warrants. The form of proposed warrant agreement relating to warrants to
purchase senior debt securities of Alcoa, including the form of warrant
certificates representing the warrants, is filed with the SEC and incorporated
by reference as an exhibit to the registration statement of which this
prospectus is a part. A copy of the warrant agreement for any other securities
offered by Alcoa will be filed with the SEC in connection with the offering of
such warrants. The following summary of certain provisions of the warrants is
not complete. You should read the applicable warrant agreement and related
warrant certificate for provisions that may be important to you.

Debt Warrants

   If Alcoa offers warrants for the purchase of debt securities, the applicable
prospectus supplement will describe the terms of the warrants, the warrant
agreement and the warrant certificates, including the following:

   . the title and aggregate number of the warrants;

   . the offering price for the warrants, if any;

   . the designation, aggregate principal amount and terms of the debt
     securities purchasable upon exercise of the warrants;

   . the designation and terms of any related debt securities with which the
     warrants are issued, and the number of warrants issued with each such debt
     security;

   . the date, if any, on and after which the warrants and the related debt
     securities will be separately transferable;

   . the principal amount of debt securities purchasable upon exercise of one
     warrant and the price at which such principal amount may be purchased upon
     such exercise;

   . the date on which the right to exercise the warrants will commence and the
     date on which such right will expire;

   . whether the warrants represented by the warrant certificates will be
     issued in registered or bearer form, and if registered, where they may be
     transferred and registered;

   . information with respect to any book-entry procedures;

                                      35



   . if applicable, the minimum or maximum amount of the warrants that may be
     exercised at any one time;

   . the currency or currency units in which the offering price, if any, and
     the exercise price are payable;

   . if applicable, a discussion of material United States Federal income tax
     considerations;

   . anti-dilution provisions of the warrants, if any;

   . redemption or call provisions, if any, applicable to the warrants; and

   . any other terms of the warrants.

   If the debt securities purchasable upon exercise of the warrants are
issuable in bearer form, the warrants may not be offered nor constitute an
offer to United States persons other than to offices outside the United States
of certain United States financial institutions. Moreover, bearer debt
securities issuable upon exercise of the warrants may not be issued to United
States persons other than to offices outside the United States of certain
United States financial institutions.

Stock Warrants

   If Alcoa offers warrants for the purchase of common stock or preferred
stock, the applicable prospectus supplement will describe the terms of the
common stock warrants or preferred stock warrants, the warrant agreement and
the warrant certificates, including the following:

   . the title and aggregate number of the warrants;

   . the offering price for the warrants, if any;

   . the designation and terms of the preferred stock that may be purchased
     upon exercise of the warrants;

   . the designation and terms of any related securities with which the
     warrants are issued, and the number of warrants issued with each such
     security;

   . the date, if any, on and after which the warrants and the related
     securities will be separately transferable;

   . the number of shares of common stock or preferred stock that may be
     purchased upon exercise of each warrant and the price at which the shares
     may be purchased upon exercise;

   . the date on which the right to exercise the warrants will commence and the
     date on which such right will expire;

   . if applicable, the minimum or maximum amount of the warrants that may be
     exercised at any one time;

   . the currency or currency units in which the offering price, if any, and
     the exercise price are payable;

   . if applicable, a discussion of material United States Federal income tax
     considerations;

   . anti-dilution provisions of the warrants, if any;

   . redemption or call provisions, if any, applicable to the warrants; and

   . any other terms of the warrants.

Exercise of Warrants

   Each warrant will entitle the holder of the warrant to purchase at the
exercise price set forth in the applicable prospectus supplement the principal
amount of debt securities or shares of preferred stock or common stock being
offered. Holders may exercise warrants at any time up to the close of business
on the expiration date set forth in the applicable prospectus supplement. After
the close of business on the expiration date, unexercised warrants are void.
Holders may exercise warrants as set forth in the prospectus supplement
relating to the warrants being offered.
   Until the exercise of their warrants to purchase debt securities, preferred
stock or common stock, holders of warrants will not have any rights as a holder
of the debt securities, preferred stock or common stock, as the case may be, by
virtue of such holder's ownership of warrants.

                                      36



                    DESCRIPTION OF STOCK PURCHASE CONTRACTS
                           AND STOCK PURCHASE UNITS

   Alcoa may issue stock purchase contracts, including contracts obligating
holders to purchase from Alcoa, and Alcoa to sell to the holders, a specified
number of shares of Alcoa common stock or other securities at a future date or
dates, which we refer to in this prospectus as ''stock purchase contracts.''
The price per share of the securities and the number of shares of the
securities may be fixed at the time the stock purchase contracts are issued or
may be determined by reference to a specific formula set forth in the stock
purchase contracts. The stock purchase contracts may be issued separately or as
part of units consisting of a stock purchase contract and debt securities,
preferred stock or warrants of Alcoa, trust preferred securities of Alcoa Trust
I or debt obligations of third parties, including U.S. treasury securities,
securing the holders' obligations to purchase the securities under the stock
purchase contracts, which we refer to herein as ''stock purchase units.'' The
stock purchase contracts may require holders to secure their obligations under
the stock purchase contracts in a specified manner. The stock purchase
contracts also may require Alcoa to make periodic payments to the holders of
the stock purchase units or vice versa, and such payments may be unsecured or
funded on some basis.

   The applicable prospectus supplement will describe the terms of the stock
purchase contracts or stock purchase units. The description in the prospectus
supplement will not necessarily be complete, and reference will be made to the
stock purchase contracts, and, if applicable, collateral or depositary
arrangements, relating to the stock purchase contracts or stock purchase units,
which will be filed with the SEC each time Alcoa issues stock purchase
contracts or stock purchase units. Certain United States Federal income tax
considerations applicable to the stock purchase contracts and stock purchase
units will also be discussed in the applicable prospectus supplement.

                                      37



         DESCRIPTION OF TRUST PREFERRED SECURITIES AND TRUST GUARANTEE

Trust Preferred Securities

   The Declaration under which the Alcoa Trust is organized will be replaced by
an amended and restated trust agreement which will authorize the trustees of
the Alcoa Trust to issue on behalf of the Alcoa Trust one series of trust
preferred securities and one series of trust common securities. The form of
trust agreement is filed with the SEC and incorporated by reference as an
exhibit to the registration statement of which this prospectus is a part. The
trust agreement will be subject to, and governed by, the Trust Indenture Act.
The trust preferred securities will be issued to the public under the
registration statement of which this prospectus is a part. The trust common
securities will be issued directly or indirectly to Alcoa. This summary of
certain terms of the trust preferred securities and the trust agreement is not
complete. For more information, you should refer to the full text of the trust
preferred securities and the trust agreement, including the definitions of
terms used and not defined in this prospectus or the related prospectus
supplement, and those made part of the trust agreement by the Trust Indenture
Act.

   The trust preferred securities will have the terms, including dividends,
redemption, voting, conversion, liquidation rights and such other preferred,
deferred or other special rights or such restrictions as set forth in the trust
agreement or made part of the trust agreement by the Trust Indenture Act. A
prospectus supplement will describe the specific terms of the trust preferred
securities the Alcoa Trust is offering, including:

   . the distinctive designation of trust preferred securities;

   . the number of trust preferred securities issued by the Alcoa Trust;

   . the annual dividend rate, or method of determining the rate, for trust
     preferred securities and the date(s) upon which dividends will be payable;

   . whether dividends on trust preferred securities will be cumulative, and,
     in the case of trust preferred securities having cumulative dividend
     rights, the date or dates or method of determining the date(s) from which
     dividends on trust preferred securities will be cumulative;

   . the amount or amounts that will be paid out of the assets of the Alcoa
     Trust to the holders of trust preferred securities upon voluntary or
     involuntary dissolution, winding up or termination of the Alcoa Trust;

   . any terms and conditions under which trust preferred securities may be
     converted into shares of capital stock of Alcoa, including the conversion
     price per share and any circumstances under which the conversion right
     will expire;

   . any terms and conditions upon which the related series of the subordinated
     debt securities of Alcoa may be distributed to holders of trust preferred
     securities;

   . any obligation of the Alcoa Trust to purchase or redeem trust preferred
     securities and the price(s) at which, the period(s) within which and the
     terms and conditions upon which trust preferred securities will be
     purchased or redeemed, in whole or in part, under that obligation;

   . any voting rights of trust preferred securities in addition to those
     required by law, including the number of votes per trust preferred
     security and any requirement for the approval by the holders of trust
     preferred securities, as a condition to specified action or amendments to
     the trust agreement; and

   . any other relevant rights, preferences, privileges, limitations or
     restrictions of trust preferred securities consistent with the trust
     agreement or with applicable law.

Under the trust agreement, the Property Trustee will own a series of
subordinated debt securities of Alcoa purchased by the Alcoa Trust for the
benefit of the holders of the trust preferred securities and the trust common
securities. The payment of dividends out of money held by the Alcoa Trust, and
payments upon redemption of trust preferred securities or liquidation of the
Alcoa Trust, will be guaranteed by Alcoa to the extent described under "Trust
Guarantee."

                                      38



   Certain United States Federal income tax considerations applicable to an
investment in trust preferred securities will be described in the applicable
prospectus supplement.

   In connection with the issuance of trust preferred securities, the Alcoa
Trust will also issue one series of trust common securities. The trust
agreement will authorize the regular trustees of the Alcoa Trust to issue on
behalf of the Alcoa Trust one series of trust common securities having such
terms as will be set forth in the trust agreement, including:

   . dividends;

   . conversion;

   . redemption;

   . voting;

   . liquidation rights; or

   . such restrictions as may be set forth in the trust agreement.

Except as otherwise provided in the prospectus supplement, the terms of the
trust common securities will be substantially identical to the terms of the
trust preferred securities. The trust common securities will rank pari passu,
and payments will be made on the trust common securities pro rata with the
trust preferred securities, except that, upon an event of default under the
trust agreement, the rights of the holders of the trust common securities to
payment in respect of dividends and payments upon liquidation, redemption and
otherwise will be subordinated to the rights of the holders of the trust
preferred securities. Except in certain limited circumstances, the trust common
securities will also carry the right to vote and appoint, remove or replace any
of the trustees of the Alcoa Trust. All of the trust common securities will be
directly or indirectly owned by Alcoa.

   Alcoa and certain of its subsidiaries maintain deposit accounts and conduct
other banking transactions, including borrowings in the ordinary course of
business, with the Property Trustee.

Trust Guarantee

   Alcoa will execute and deliver a guarantee, concurrently with the issuance
by the Alcoa Trust of its trust preferred securities, for the benefit of the
holders from time to time of the trust preferred securities. The accompanying
prospectus supplement will describe any significant differences between the
actual terms of the trust guarantee and the summary below. The following
summary of the trust guarantee is not complete. For more information, you
should refer to the full text of the trust guarantee, including the definitions
of terms used and not defined in this prospectus or the related prospectus
supplement and those terms made a part of the trust guarantee by the Trust
Indenture Act. The form of trust guarantee is filed with the SEC and
incorporated by reference as an exhibit to the registration statement of which
this prospectus is a part.

  General

   Alcoa will irrevocably and unconditionally agree, to the extent set forth in
the trust guarantee, to pay in full to the holders of trust preferred
securities the trust guarantee payments, except to the extent paid by the Alcoa
Trust, as and when due, regardless of any defense, right of set-off or
counterclaim that the Alcoa Trust may have or assert. The following payments
with respect to the trust preferred securities, to the extent not paid by the
Alcoa Trust, will be subject to the trust guarantee, without duplication:

   . any accrued and unpaid dividends that are required to be paid on the trust
     preferred securities, to the extent the Alcoa Trust has funds legally
     available therefor;

   . the redemption price, including all accrued and unpaid dividends, payable
     out of funds legally available therefor, with respect to any trust
     preferred securities called for redemption by the Alcoa Trust; and

                                      39



   . upon a liquidation of the Alcoa Trust, other than in connection with the
     distribution of subordinated debt securities of Alcoa to the holders of
     the trust preferred securities or the redemption of all of the trust
     preferred securities issued by the Alcoa Trust, the lesser of:

       . the aggregate of the liquidation amount and all accrued and unpaid
         dividends on the trust preferred securities to the date of payment; and

       . the amount of assets of the Alcoa Trust remaining available for
         distribution to holders of trust preferred securities in liquidation
         of the Alcoa Trust.

Alcoa's obligation to make a trust guarantee payment may be satisfied by
Alcoa's direct payment of the required amounts to the holders of trust
preferred securities or by causing the Alcoa Trust to pay the amounts to the
holders.

  Covenants of Alcoa

   In the trust guarantee, Alcoa will covenant that, so long as any trust
preferred securities issued by the Alcoa Trust remain outstanding, if there has
occurred any event that would constitute an event of default under the trust
guarantee or the trust agreement, then:

   . Alcoa will not declare or pay any dividend on, make any distributions with
     respect to, or redeem, purchase or make a liquidation payment with respect
     to, any of its common stock, other than:

       . purchases or acquisitions of shares of common stock in connection with
         the satisfaction by Alcoa of its obligations under any employee
         benefit plan;

       . as a result of a reclassification of Alcoa's common stock or the
         exchange or conversion of one class or series of Alcoa's common stock
         for another class or series of Alcoa's common stock;

       . the purchase of fractional interests in shares of Alcoa's common stock
         under the conversion or exchange provisions of such common stock or
         the security being converted or exchanged; or

       . purchases or acquisitions of shares of common stock to be used in
         connection with acquisitions of common stock by shareholders under
         Alcoa's dividend reinvestment plan;

     or make any guarantee payments with respect to the foregoing; and

   . Alcoa will not make any payment of principal of, or premium, if any, on or
     repurchase any debt securities issued by Alcoa (including guarantees)
     which rank pari passu with or junior to the subordinated debt securities,
     other than at stated maturity.

  Amendment and Assignment

   Except with respect to any changes that do not adversely affect the rights
of holders of trust preferred securities, in which case no vote will be
required, the trust guarantee may be amended only with the prior approval of
the holders of not less than a majority in liquidation amount of the
outstanding trust preferred securities. The manner of obtaining any approval of
the holders will be as set forth in an accompanying prospectus supplement. All
guarantees and agreements contained in the trust guarantee will bind the
successors, assigns, receivers, trustees and representatives of Alcoa and will
inure to the benefit of the holders of the trust preferred securities then
outstanding.

  Termination

   The trust guarantee will terminate:

   . upon full payment of the redemption price of all trust preferred
     securities;


                                      40



   . upon distribution of the subordinated debt securities of Alcoa held by the
     Alcoa Trust to the holders of the trust preferred securities; or

   . upon full payment of the amounts payable in accordance with the trust
     agreement upon liquidation of the Alcoa Trust.

The trust guarantee will continue to be effective or will be reinstated, as the
case may be, if at any time any holder of trust preferred securities must
restore payment of any sums paid under those trust preferred securities or the
trust guarantee. The subordination provisions of the subordinated debt
securities and the trust guarantee, respectively, will provide that in the
event payment is made on the subordinated debt securities or the trust
guarantee in contravention of the subordination provisions, such payments will
be paid over to the holders of Senior Debt.

  Ranking of the Trust Guarantee

   The trust guarantee will constitute an unsecured obligation of Alcoa and
will rank:

   . subordinate and junior in right of payment to all other liabilities of
     Alcoa;

   . pari passu with the most senior preferred or preference stock, if any,
     thereafter issued by Alcoa and with any guarantee thereafter entered into
     by Alcoa in respect of any preferred or preference stock or interests of
     any affiliate of Alcoa; and

   . senior to Alcoa's common stock.

The trust agreement will provide that each holder of trust preferred securities
by acceptance of those securities agrees to the subordination provisions and
other terms of the trust guarantee.

   The trust guarantee will constitute a guarantee of payment and not of
collection. The trust guarantee will be deposited with the Property Trustee to
be held for the benefit of the trust preferred securities. The Property Trustee
will have the right to enforce the trust guarantee on behalf of the holders of
the trust preferred securities. The holders of not less than a majority in
aggregate liquidation amount of the trust preferred securities will have the
right to direct the time, method and place of conducting any proceeding for any
remedy available in respect of the trust guarantee, including the giving of
directions to the Property Trustee. Any holder of trust preferred securities
may institute a legal proceeding directly against Alcoa to enforce its rights
under the trust guarantee, without first instituting a legal proceeding against
the Alcoa Trust, or any other person or entity. The trust guarantee will not be
discharged except by payment of the trust guarantee payments in full to the
extent not paid by the Alcoa Trust, and by complete performance of all
obligations under the trust guarantee.

  Governing Law

   The trust guarantee will be governed by and construed in accordance with the
laws of the State of New York.

                                      41



                             PLAN OF DISTRIBUTION

   Alcoa and/or the Alcoa Trust may sell the securities in one or more of the
following ways:

   . to underwriters for public offering and sale by them;

   . directly to purchasers;

   . through agents;

   . through dealers; or

   . through a combination of any of these methods of sale.

   Offers to purchase securities may be solicited directly by Alcoa and/or the
Alcoa Trust or by agents designated by Alcoa and/or the Alcoa Trust from time
to time. Any agent, who may be deemed to be an underwriter, as that term is
defined in the Securities Act, involved in the offer and sale of the securities
will be named, and any commissions payable by Alcoa and/or the Alcoa Trust to
that agent will be provided, in an applicable prospectus supplement. Alcoa
and/or the Alcoa Trust and its agents may sell the securities at:

   . a fixed price or prices, which may be changed;

   . market prices prevailing at the time of sale;

   . prices related to such prevailing market prices; or

   . negotiated prices.

   Underwriters, dealers and agents participating in the distribution of the
securities may be deemed to be underwriters, and any discounts and commissions
received by them and any profit realized by them on resale of the securities
may be deemed to be underwriting discounts and commissions under the Securities
Act. Underwriters, dealers and agents may be entitled, under agreements with
Alcoa and/or the Alcoa Trust, to indemnification against and contribution
toward certain civil liabilities, including liabilities under the Securities
Act, and to reimbursement by Alcoa and/or the Alcoa Trust for certain expenses.

   If an underwriter or underwriters are used in the offer or sale of
securities, Alcoa and/or the Alcoa Trust will execute an underwriting agreement
with the underwriters at the time of sale of the securities to the
underwriters, and the names of the underwriters and the principal terms of
Alcoa's and/or the Alcoa Trust's agreements with the underwriters will be
provided in the applicable prospectus supplement.

   If indicated in an applicable prospectus supplement, Alcoa and/or the Alcoa
Trust will authorize dealers acting as agents for Alcoa and/or the Alcoa Trust
to solicit offers by certain institutions to purchase securities from Alcoa
and/or the Alcoa Trust at the public offering price set forth in the prospectus
supplement under delayed delivery contracts providing for payment and delivery
on the date or dates stated in the prospectus supplement. The terms of such
delayed delivery contracts will be set forth in the applicable prospectus
supplement.

   If indicated in an applicable prospectus supplement, Alcoa may sell shares
of Alcoa common stock under a newly established direct stock purchase and
dividend reinvestment plan. The terms of any such plan will be set forth in the
applicable prospectus supplement.

   Each underwriter, dealer and agent participating in the distribution of any
of the securities that are issuable in bearer form will agree that it will not
offer, sell or deliver, directly or indirectly, securities in bearer form in
the United States or to United States persons, other than qualifying financial
institutions, during the restricted period, as defined in United States
Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7).

   Except for shares of Alcoa common stock or as otherwise described in an
applicable prospectus supplement, all of the securities will be a new issue of
securities with no established trading market. Any underwriters to whom or
agents through whom the securities are sold by Alcoa and/or the Alcoa Trust for
public offering and sale may make a market in the securities, but such
underwriters or agents will not be obligated to do so and may discontinue any
market making at any time without notice. No assurance can be given as to the
liquidity of the trading market for any such securities.


                                      42



   Certain of the underwriters, dealers or agents and their associates may be
customers of, engage in transactions with and perform services for Alcoa and
its subsidiaries in the ordinary course of business.

                                 LEGAL MATTERS

   Unless otherwise indicated in the applicable prospectus supplement, the
validity of the securities offered by Alcoa will be passed upon for Alcoa by
Thomas F. Seligson, Esq., Counsel of Alcoa. The validity of the trust preferred
securities will be passed upon for the Alcoa Trust by Skadden, Arps, Slate,
Meagher & Flom LLP, New York, New York, special counsel to Alcoa and the Alcoa
Trust. The validity of all of the securities offered by this prospectus will be
passed upon for any underwriters or agents by Cravath, Swaine & Moore, New
York, New York. Mr. Seligson is paid a salary by Alcoa, is a participant in
various employee benefit plans offered by Alcoa to employees of Alcoa generally
and has options to purchase shares of Alcoa common stock. Cravath,
Swaine & Moore currently represents Alcoa on various matters and may continue
to do so in the future.

                            INDEPENDENT ACCOUNTANTS

   The consolidated financial statements and related schedule of Alcoa and its
subsidiaries incorporated in this prospectus by reference to Alcoa's Annual
Report on Form 10-K, as amended, for the fiscal year ended December 31, 2000,
have been so incorporated in reliance on the reports of PricewaterhouseCoopers
LLP, independent accountants, given on the authority of said firm as experts in
auditing and accounting.

   With respect to the unaudited financial information of Alcoa for the
three-month periods ended March 31, 2001 and 2000, the three-month and
six-month periods ended June 30, 2001 and 2000, and the three-month and
nine-month periods ended September 30, 2001 and 2000, incorporated by reference
in this prospectus, PricewaterhouseCoopers LLP reported that they have applied
limited procedures in accordance with professional standards for a review of
such information. However, their separate reports dated April 5, 2001, except
for Note L, for which the date is April 20, 2001, July 6, 2001, except for Note
N, for which the date is August 6, 2001, and October 4, 2001 incorporated by
reference herein, states that they did not audit and they do not express an
opinion on that unaudited financial information. Accordingly, the degree of
reliance on their reports on such information should be restricted in light of
the limited nature of the review procedures applied. PricewaterhouseCoopers LLP
is not subject to the liability provisions of Section 11 of the Securities Act
of 1933 for their reports on the unaudited financial information because those
reports are not "reports" or "parts" of the registration statement prepared or
certified by PricewaterhouseCoopers LLP within the meaning of Sections 7 and 11
of the Act.

                                      43



                        PRINCIPAL OFFICE OF ALCOA INC.

                            Alcoa Corporate Center
                              201 Isabella Street
                      Pittsburgh, Pennsylvania 15212-5858

                      TRUSTEE AND PRINCIPAL PAYING AGENT

                J.P. Morgan Trust Company, National Association
                               One Oxford Centre
                         301 Grant Street, Suite 1100
                        Pittsburgh, Pennsylvania 15219

                   LUXEMBOURG PAYING AGENT & TRANSFER AGENT

                         Deutsche Bank Luxembourg S.A.
                          2 Boulevard Konrad Adenauer
                            L-1115 G.D. Luxembourg

                                LEGAL ADVISORS

                       To Alcoa                 To the Underwriters

                  Thomas F. Seligson          Cravath, Swaine & Moore
                        Counsel                  825 Eighth Avenue
                      Alcoa Inc.              New York, New York 10019
                Alcoa Corporate Center
                  201 Isabella Street
          Pittsburgh, Pennsylvania 15212-5858

                            INDEPENDENT ACCOUNTANTS

                          PricewaterhouseCoopers LLP
                               600 Grant Street
                        Pittsburgh, Pennsylvania 15219

                                 LISTING AGENT

                         Deutsche Bank Luxembourg S.A.
                          2 Boulevard Konrad Adenauer
                            L-1115 G.D. Luxembourg



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