The effect of computer assisted instruction (CAI) in Kansas City, Missouri Schools on selected achievement measures and perceptions about the CAI experience collected from students, teachers, and CAI lab aides was examined. At the secondary school level, the evaluation examined the effects of CAI mathematics and social studies lessons on eighth and ninth grade students. CAI reading and mathematics lessons were used at the elementary school level. The report separates evaluation results into high school, junior high school, and elementary school levels. Teachers, students, and lab aides displayed positive attitudes toward CAI. The CAI labs had a positive effect on achievement as measured by the Iowa Tests of Basic Skills and the Tests of Academic Proficiency. Computer response time caused the greatest amount of frustration for students participating in CAI lessons. Appendices include opinions of students and teachers concerning CAI labs, and analysis of variance and analysis of covariance summaries. (DWH)