Exhibit 11 CACI INTERNATIONAL INC AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (amounts in thousands, except per share data) Three Months Ended September 30, 1998 1997 ------------------- Net income $ 3,139 $ 2,432 Average shares outstanding during the period 10,858 10,705 Dilutive effect of stock options after application of treasury stock method 344 370 ------- ------- Average number of shares outstanding during the period 11,202 11,075 ======= ======= Basic earnings per common share $ 0.29 $ 0.23 ======= ======= Diluted earnings per share $ 0.28 $ 0.22 ======= =======