The program was derived from a series of sequential studies of the principles of effective correctional programs. These studies indicated that many offenders evidence deficits in cognitive skills which are essential for prosocial adjustment and that training in these skills is an essential ingredient of effective correctional programs. Compared to regular probation and life skills training, cognitive training provided by probation officers led to a major reduction in rearrest rates and incarceration rates among adult high-risk probationers. (Author abstract)