1 EXHIBIT 23 (a) CONSENT OF INDEPENDENT ACCOUNTANTS We consent to the incorporation by reference in the registration statements No. 33-41995, No. 33-61493, No. 33-50160 and No. 333-12237 on Form S-8 and No. 333-43263 on form S-3 of our reports dated February 5, 1999 (February 23, 1999 as to Note 2), appearing in and incorporated by reference in the Annual Report on Form 10-K of Computer Task Group, Incorporated and Subsidiaries for the year ended December 31, 1998. DELOITTE & TOUCHE LLP Buffalo, New York March 29, 1999