The project aimed to focus primary attention on the behavioral problems the police must handle by developing a capacity within the police to examine the specific behavioral problems with which they must deal. The most experimental aspects of the study process were designing an appropriate form of inquiry; using various data sources; adopting a broad, fresh perspective in researching each problem; and internalizing the process within the police agency. The studies gave the police information which was not previously available and which provided a solid basis for evaluating current police responses and for developing alternative recommendations. The extensive data collection effort resulted in accuracy in defining each problem. It also produced many side benefits in the police agency. Detailed descriptions of the methodologies used in each of the studies are included. For related volumes presenting the case studies and discussing the problem-oriented approach, see NCJ 91292-4.