EXHIBIT 99.1


       STATEMENT UNDER OATH OF PRINCIPAL EXECUTIVE OFFICER REGARDING FACTS AND
CIRCUMSTANCES RELATING TO EXCHANGE ACT FILINGS


I, Leslie M. Muma, President and Chief Executive Officer of Fiserv, Inc., a
Wisconsin corporation ("Fiserv"), state and attest that:

       1.     To the best of my knowledge, based upon a review of the covered
              reports of Fiserv, and, except as corrected or supplemented in a
              subsequent covered report:

              o      no covered report contained an untrue statement of a
                     material fact as of the end of the period covered by such
                     report (or in the case of a report on Form 8-K or
                     definitive proxy materials, as of the date on which it was
                     filed); and

              o      no covered report omitted to state a material fact
                     necessary to make the statements in the covered report, in
                     light of the circumstances under which they were made, not
                     misleading as of the end of the period covered by such
                     report (or in the case of a report on Form 8-K or
                     definitive proxy materials, as of the date on which it was
                     filed).

       2.     I have reviewed the contents of this statement with Fiserv's audit
              committee.

       3.     In this statement under oath, each of the following, if filed on
              or before the date of this statement, is a "covered report":

              o      2001 Annual Report on Form 10-K of Fiserv;

              o      all reports on Form 10-Q, all reports on Form 8-K and all
                     definitive proxy materials of Fiserv filed with the
                     Commission subsequent to the filing of the Form 10-K
                     identified above; and

              o      any amendments to any of the foregoing.



/s/ Leslie M. Muma                              Subscribed and sworn to
- --------------------------                      before me this 23rd day of July,
Leslie M. Muma                                  2002.
July 23, 2002
                                                /s/
                                                --------------------------------
                                                Notary Public
                                                My Commission Expires:  07/24/05