This note describes a procedure to map the frequency and location of calls to the police. Maps may be generatedfor all calls in a city or limited to certain types of calls or certain geographic areas. Computer maps can be produced by line printers or by plotters. An empirical application of the procedure (an evaluation of the effects of an intervention program) is presented, and the strengths and limitations of the system are discussed. Problems in applying this computer technology are also considered.
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