This model defines three aspects of a crime prevention measure: its orientation, its range, and its strategy. Data were gathered on 280 prevention measures and 106 measurements of the effects on criminality. Results revealed that the prevention model describes the total group of prevention measures. Seventy-three percent of the measures were situation-oriented, and 36 percent were person-oriented. In addition, 43 of the 106 measurements were determined to be useful for the current study, based on the validity of their conclusions. Moreover, the effect of prevention measures on crime depended on three factors: intensity, the seriousness of the crime problem, and strategy. Furthermore, crime prevention measures that were focused on a situation or on specific offenses were effective more often than were measures that were person-oriented. Figures, tables, footnotes, and background and reference lists