An 18-month project was conducted to create a microcomputer version of the National Center for Research in Vocational Education's Career Planning System (CPS) designed for use with mildly mentally retarded, learning disabled, and behaviorally handicapped middle school students. Separate formative and summative evaluations measured the effectiveness of the microcomputer version of CPS. During the formative evaluation, researchers administered exit interviews to 49 students completing the 10-week pilot test of CPS and asked the 7 teachers at the 5 pilot test sites to complete instructor logs. Summative data were gathered through two evaluation instruments: data regarding the impact of the CPS materials were obtained via the administration of pre- and posttests to students in experimental and control groups, and data concerning the teachers' assessments of the programs' overall quality were elicited through a five-point rating scale that was included on the instructor log. Students and teachers alike found the microcomputer version of CPS interesting, enjoyable, and usable. The pre- and posttest scores of the experiment group further attested to the effectiveness of CPS. (Copies of the evaluation instruments used are appended.) (MN)