Many aspects of computer managed instruction (CMI) are discussed in this paper which focuses on the use of computer technology to support teachers in their efforts to provide effective instruction. The nature of instructional management is explained and links to microcomputer capabilities are established. Microcomputer hardware and software characteristics are presented as they relate specifically to instructional management applications. The information presented is designed to help teachers get started in the use of microcomputers to support their instructional programs. Finally, profiles of seven diverse CMI programs provide a glimpse of microcomputer-based CMI concepts in practice. This paper emphasizes generalized CMI systems, i.e., those not tied to a particular curriculum content or computer assisted instruction program. A glossary and a list of CMI resources with addresses are included. (LMM)