Although a number of models of crime prevention problem solving have been proposed, they all feature a systematic analysis of the nature of the problem based on reliable data. This systematic analysis of the problem becomes the basis for devising or selecting a criminological theory to underlie the problem solving strategy developed. It is important that any planned intervention be the logical extension of a sound theory. Theory helps in understanding problems and interpreting outcomes, including how crime reductions were or were not achieved. In developing crime-prevention strategy, it is important to incorporate planning for data-based measures of progress in implementation and outcomes. Periodic evaluations should then be conducted to determine whether the strategy is being implemented as intended and whether or not it is having the intended effect of reducing targeted crimes. The planning of crime-prevention strategies should be sensitive to the characteristics of the communities and locations in which the strategy will be implemented, this includes attention to the social, cultural, and physical settings in which the strategy will be executed, as well as the target group for the interventions, the political climate, and how particular actions in the strategy may impact these variables. Flexibility is required because of the unforeseen and unpredictable consequences of a new intervention. 42 references