EXHIBIT 99.3

                            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 Quarterly Report of ANSYS INC. (the "Company") on
Form 10-Q for the quarter ended March 31, 2003 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Maria T. Shields,
Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that
to my knowledge:

     (1)    The Report fully complies with requirements of section 13(a) or
            15(d) 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/ Maria T. Shields
     -----------------------
     Maria T. Shields
     Chief Financial Officer
     May 12, 2003