Personal motives underlying computer crime are economic, egocentric, ideological, and psychotic. Environmental motives or stimuli are the work environment, the reward system, the level of interpersonal trust, the ethics level, the stress level, and the level of internal controls. Part of computer crime prevention is the development of an organizational environment that diminishes the motivation for computer crime by providing alternative motivational stimuli and factors which increase the probability that the crime will be discovered. Important factors in the motivational environment are adequate rewards, management controls, performance feedback mechanisms, operational reviews, and factors to counter employee hostility. Factors that increase the probability that computer crime will be discovered include internal accounting controls, computer access controls, an exceptions logging system, a management information system, and intelligence gathering. This article lists the organizational factors that create high-fraud and low-fraud potential. A list of security measures to counter computer crime includes passwords, compartmentalization of employee responsibilities, voice print and fingerprint recognition, a time lock, personal signature recognition, and data communications controls.