Exhibit No. 11 HARDING LAWSON ASSOCIATES GROUP, INC. Computation of Net Income Per Share (In thousands, except per share data) (Unaudited) - ------------------------------------------------------------------------------------------------------------------- Three Months Ended Nine Months Ended February 29/28, February 29/28, 2000 1999 2000 1999 - ------------------------------------------------------------------------------------------------------------------- Weighted average basic shares outstanding 5,004 4,815 4,984 4,844 Net effect of dilutive stock options based on the treasury stock method 141 15 166 46 - ------------------------------------------------------------------------------------------------------------------- Total 5,145 4,830 5,150 4,890 =================================================================================================================== Net income $1,231 $ 414 $3,950 $1,566 =================================================================================================================== Basic net income per share $ 0.25 $ 0.09 $ 0.79 $ 0.32 =================================================================================================================== Diluted net income per share $ 0.24 $ 0.09 $ 0.77 $ 0.32 =================================================================================================================== 15