In order to develop a systematic procedure for the evaluation and revision of educational software for microcomputers, a study was undertaken by the Educational Products Information Exchange (EPIE) Institute and the Microcomputer Resource Center at Columbia University to define the criteria that are needed to evaluate instructional microcomputer programs. A set of commercially-produced educational programs for microcomputers selected for analysis. The software evaluation instrument developed and revised during the course of the project was adapted from the EPIE instructional materials analysis instrument. After the instrument was developed, eight analysts evaluated the instructional programs and an analytical procedure evolved which provides descriptive/prescriptive information about instructional software. A reliability study conducted during the project indicated that the accuracy of the analysts' evaluations ranged from 76 percent on the first evaluation to 96 percent on the final evaluation. Significant findings show that most commercial courseware programs on the market stress a drill and practice approach to the study of arithmetic and are oriented toward the elementary school level. It was concluded that most programs did not utilize instructional strategies which facilitate conceptual learning. One figure, five tables, a reference list, a glossary, and the evaluation instrument accompany the text. A copy of the evaluation instrument is appended. (Author/JL)