The purpose of this study was to investigate the effect of the simulation and laboratory activities, and combination of them as a teaching tool on the students' attitudes towards computer. The quasi-experimental design was used. Control group I in which the real laboratory activities were used, to the control group II in which simulation activities were used and to the experimental group in which both simulation and laboratory activities were used together. Computer Attitude Test (CAT) was used as measurement tool. According the ANCOVA results, using computer simulations indicate a significant effect on students' attitudes towards computer. (C) 2011 Published by Elsevier Ltd.