Exhibit 99.1

                                  FORM OF PROXY

        THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS FOR THE
SPECIAL MEETING OF THE STOCKHOLDERS OF AVIDYN, INC.
                   TO BE HELD __________, _____________, 2003

         The undersigned hereby acknowledges receipt of the Notice of the
Special Meeting of Stockholders of AVIDYN, Inc. to be held on _________,
_____________, 2003, at 9:30 a.m., local time, at AVIDYN'S executive offices,
16980 Dallas Parkway, Suite 120, Dallas, Texas 75248 and the Proxy Statement in
connection therewith, and appoints _____________________and
______________________, and each of them, as the lawful agents and proxies of
the undersigned (with all powers the undersigned would possess if personally
present, including full power of substitution), and hereby authorizes them to
represent and to vote, as designated below, all the shares of Common Stock of
AVIDYN, Inc. held of record by the undersigned as of the close of business on
_________________, 2002, at the Special Meeting of Stockholders or any
adjournment or postponement thereof.

1. PROPOSAL TO ADOPT THE AGREEMENT AND PLAN OF MERGER DATED AS OF NOVEMBER 2,
2002, BY AND AMONG FISERV, INC., FISERV MERGER SUB, INC., A WHOLLY OWNED
SUBSIDIARY OF FISERV, INC., AND AVIDYN, INC., AND TO APPROVE THE MERGER
CONTEMPLATED BY THAT AGREEMENT.

                  FOR               AGAINST          ABSTAIN
                  [ ]               [ ]                 [ ]

2. IN HIS DISCRETION, THE PROXY IS AUTHORIZED TO VOTE UPON ANY MATTERS WHICH MAY
PROPERLY COME BEFORE THE SPECIAL MEETING, OR ANY ADJOURNMENT OR POSTPONEMENT
THEREOF.

                  FOR               AGAINST          ABSTAIN
                  [ ]               [ ]                 [ ]



         It is understood that when properly executed, this Proxy will be voted
in the manner directed herein by the undersigned stockholder. WHERE NO CHOICE IS
SPECIFIED BY THE STOCKHOLDER, THE PROXY WILL BE VOTED "FOR" THE NAMED PROPOSALS.

This Proxy Is Solicited On Behalf Of The Board Of Directors Of AVIDYN, Inc.

         The undersigned hereby revokes all previous proxies related to the
shares covered hereby and confirms all that said Proxy and his substitutes may
do by virtue hereof.

                                                Please sign exactly as name(s)
                                                appear below. When shares are
                                                held by joint tenants, both
                                                should sign. When signing as
                                                attorney, executor,
                                                administrator, trustee or
                                                guardian, please give full title
                                                as such. If a corporation,
                                                please sign in full corporate
                                                name by President or other
                                                authorized officer. If a
                                                partnership, please sign in
                                                partnership name by authorized
                                                person.

                                                Dated: ___________________, 2002

                                                ________________________________
                                                Signature

                                                ________________________________
                                                Signature if held jointly

PLEASE MARK, SIGN, DATE AND RETURN THE PROXY CARD PROMPTLY USING THE ENCLOSED
ENVELOPE.

[ ]   PLEASE CHECK THIS BOX IF YOU INTEND TO BE PRESENT AT THE SPECIAL MEETING.