EXHIBIT 99.1

                           CERTIFICATION PURSUANT TO
                            18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                 SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Annual Report of Comshare, Incorporated (the "Company")
on Form 10-Q for the quarterly period ended March 31, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Dennis
G. Ganster, Chief Executive Officer of the Company, certify, pursuant to 18
U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of
2002, that:

         (1) The Report fully complies with the requirements of Section 13(a) of
the Securities Exchange Act of 1934; and

         (2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.




/s/  Dennis G. Ganster
------------------------------------
Dennis G. Ganster
Chief Executive Officer
May 15, 2003





                  A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY
                  SECTION 906 HAS BEEN PROVIDED TO COMSHARE, INCORPORATED AND
                  WILL BE RETAINED BY COMSHARE, INCORPORATED AND FURNISHED TO
                  THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON
                  REQUEST.