1. Name and Address of Reporting Person
NAFUS, EDWARD C.
7887 E. Belleview Avenue
Suite 1000
Englewood, CO 80111
USA
2. Issuer Name and Ticker or Trading Symbol
CSG Systems International, Inc. (CSGS)
3. IRS or Social Security Number of Reporting Person (Voluntary)
4. Statement for Month/Year
2001
5. If Amendment, Date of Original (Month/Day/Year)
6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
( ) Director ( ) 10% Owner
( ) Officer (give title below) (X) Other (specify below)
Executive Vice President
7. Individual or Joint/Group Filing (Check Applicable Line)
(X) Form filed by One Reporting Person
( ) Form filed by More than One Reporting Person
TABLE I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
+---------------------------------+----------+-------------+-----------------------------+----------------+-----------+------------+
|1. Title of Security |2. Trans- |3. Trans- |4. Securities Acquired (A) |5. Amount of |6. Owner- |7. Nature |
| | action | action | or Disposed of (D) | Securities | ship | of In- |
| | Date | Code | | Beneficially | Form: | direct |
| | | | | Owned at | Direct | Bene- |
| | (Month/ | | | End of | (D) or | ficial |
| | Day/ | +-----------+------+----------+ Year | Indirect| Owner- |
| | Year) | |Amount |A/D |Price | | (I) | ship |
+---------------------------------+----------+-------------+-----------+------+----------+----------------+-----------+------------+
Common Stock 17080 D
TABLE II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned
+-------------+--------+----------+---------+-----------+---------------------+----------------+----------+--------+-------+-------+
|1. |2. |3. |4. |5. |6. |7. |8. |9. |10. |11. |
| | | | | | | | |Number |Owner- | |
| | | | | | | | |of |ship | |
| | | | | | | | |Deriv- |Form of| |
| | | | | | |Title and Amount| |ative |Deriv- | |
| | | | | | |of Underlying | |Secur- |ative |Nature |
| |Conver- | | |Number of | |Securities | |ities |Secur- |of |
| |sion or | | |Derivative |Date Exercisable +-------+--------+ |Benefi- |ity: |In- |
| |Exercise| | |Securities |and Expiration Date | |Amount | |cially |Direct |direct |
| |Price of|Transac- |Transac- |Acquired(A)|(Month/Day/Year) | |or | |Owned |(D) or |Bene- |
|Title of |Deriv- |tion Date |tion Code|Disposed(D)+----------+----------+ |Number |Price of |at End |In- |ficial |
|Derivative |ative |(Month/ | +-----+-----+Date Exer-|Expira- | |of |Derivative|of |direct |Owner- |
|Security |Security|Day/Year) | |(A) |(D) |cisable |tion Date |Title |Shares |Security |Year |(I) |ship |
+-------------+--------+----------+---------+-----+-----+----------+----------+-------+--------+----------+--------+-------+-------+
Stock Options $21 08/18/2008 Common 160120 D
(Right to buy) Stock
Stock Options $26.7188 11/17/2008 Common 80000 D
(Right to buy) Stock
Stock Options $34.43 12/14/2001 A 37500 12/14/2002 12/14/2011 Common 37500 $0.0000 37500 D
(Right to buy) Stock
Stock Options $38.4375 01/07/2010 Common 25000 D
(Right to buy) Stock
Stock Options $47 01/17/2011 Common 35000 D
(Right to buy) Stock
Explanation of Responses:
This stock option is exercisable in 4 equal installments.
SIGNATURE OF REPORTING PERSON
/s/ EDWARD C. NAFUS
DATE
02/01/2002