The use of evaluation to maximize the effectiveness and efficiency of the Ontario Police College in the delivery of a refresher training program for police officers is described. Confronted by a growing backlog of patrol officers requiring refresher training and ongoing financial constraints, in 1997 the College, in co-operation with Ontario police services, initiated a comprehensive refresher training needs analysis. A multi-stage, multi-method strategy was employed in the research. The results of the needs analysis were used to redesign the curriculum, format, and delivery of the Advanced Patrol Training (APT) refresher course for patrol constables. As a result of the APT redesign, the number of police officers receiving refresher training increased by an average of 657% annually (effectiveness), while costs associated with the APT course decreased by 50% (efficiency). The evaluation, design, and delivery of the APT course has become a model for other police training programs in Ontario.