EXHIBIT 11 COMPUTER TASK GROUP, INCORPORATED COMPUTATION OF DILUTED EARNINGS PER SHARE UNDER THE TREASURY STOCK METHOD SET FORTH IN STATEMENT OF FINANCIAL ACCOUNTING STANDARDS NO. 128 "EARNINGS PER SHARE" (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA) QUARTER ENDED THREE QUARTERS ENDED SEPT. 27, SEPT. 28, SEPT. 27, SEPT. 28, 2002 2001 2002 2001* --------- --------- --------- -------- Weighted-average number of shares outstanding during period 16,575 16,443 16,555 16,415 Add Common Stock equivalents - incremental shares under stock option plans 238 - 383 - ------ ------ ------ ------ Number of shares on which diluted earnings per share is based 16,813 16,443 16,938 16,415 ======= ====== ====== ====== Net income (loss) for the period $ 141 $ 182 $(35,777) $(2,555) ======= ======= ======== ======= Diluted income (loss) per share $ 0.01 $ 0.01 $ (2.11) $ (0.16) Basic income (loss) per share $ 0.01 $ 0.01 $ (2.16) $ (0.16) * As the Company had a net loss from continuing operations for the period presented, the number of incremental shares under the Company's stock option plans is considered to be zero as the inclusion of such shares would cause the diluted loss per share calculation to be anti-dilutive. 17