1 Exhibit 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the registration statements on Form S-8 (Nos. 33-47661, 33-68426, 333-00563, 33-01557, and 333-08371) of American Management Systems, Incorporated of our report dated February 18, 1998, appearing on page 22, of the 1997 Financial Report which is incorporated in this Annual Report on Form 10-K. We also consent to the incorporation by reference of our report on the Financial Statement Schedule, which appears on page 10 of this Form 10-K. PRICE WATERHOUSE LLP Washington, D.C. March 27, 1998 53