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In recent years, much effort has been expended in trying to adapt the computer to the education field. Under the title computer-assisted instruction (CAI), many research projects have designed systems to assist in teaching a wide variety of subjects. Although experiences appear to be broad, the effectiveness of CAI is not clear. In addition, almost all researchers have avoided the question of cost and hence practicality of using CAI. A comprehensive survey of the CAI field, in addition to an outline of the application of CAI to a police departnent, is presented.