Discusses the emerging role of microcomputer systems in criminal justice agencies (CJ). Focuses on the four types of microcomputers in existence today. Several general applications now found in CJ agencies are discussed in detail. Database management systems are the most visible application and an entire chapter is devoted to it, in addition to describing seven specific applications. Electronic Bulletin Board Systems (BBS) and advanced applications on microcomputers, including expert systems are also discussed. A final chapter presents conclusions on the impact of microcomputers in CJ agencies.