Computer Assisted Instruction (CAI) encompasses a broad range of computer technologies that supplement the classroom learning environment and can dramatically increase a student’s access to information. This study was aimed at determining the effect of CAI on the academic achievement of junior high school students in Pre-technical Skills. The study employed the quasi-experiment, pretest-posttest non equivalent groups design in two junior high schools purposively selected for the experiment. In all, eighty junior high school second year students participated in the study. Using the results of a pre-test, the schools were put into treatment and control groups. The treatment group completed a CAI based learning programme over a period of four weeks. The control group received the instruction through the traditional method of teaching at the same period. The study revealed that there is no significant difference between the general performance of the experimental group and that of the control group. However, it was concluded that CAI has influence on the learning of specific aspects of basic design.