EXHIBIT 15 April 21, 1997 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 RE: ANSYS, Inc. and Subsidiaries 1. Form S-8 (Registration No. 333-8613) 1996 Stock Option and Grant Plan Employee Stock Purchase Plan Ladies & gentlemen: We are aware that our report dated April 21, 1997 on our review of the interim financial information of ANSYS, Inc. and Subsidiaries for the three-month period ended March 31, 1997 is incorporated by reference in the registration statement referred to above. Pursuant to Rule 436(c) under the Securities Act of 1933, this report should not be considered a part of the registration statement prepared or certified by us within the meaning of Sections 7 and 11 of that Act. Very truly yours, /s/ Coopers & Lybrand L.L.P. - ----------------------------