In this study, the effects of computer assisted cooperative learning method on students' performance of using colours in art education were examined. 15 students at the ages between 12 and 15 who owned a personal computer and had access to the internet were selected to form the experimental group. 35 students at the same time age and education levels were randomly selected to form the control group. In order to determine the students' performance in using colours a performance instruction was developed. The program took place for six weeks and at the end of the program posttest drawings were collected. In this study the results were in favour of the experimental group.