EXHIBIT 99.1

                Written Statement of the Chief Executive Officer
                       Pursuant to 18 U.S.C. Section 1350

Solely for the purposes of complying with 18 U.S.C. Section 1350, I, the
undersigned President and Chief Executive Officer of Fiserv, Inc. (the
"Company"), hereby certify that the Quarterly Report on Form 10-Q of the Company
for the quarter ended September 30, 2002 (the "Report") fully complies with the
requirements of Section 13(a) of the Securities Exchange Act of 1934 and that
information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.

by   /s/ Leslie M. Muma
     -------------------------
     LESLIE M. MUMA
     October 21, 2002