The participants had been admitted between 1985 and 1992 into a 12-week specialized treatment program in a large Canadian city. The program used a behavioral systems model of the development and treatment of aggression and antisocial behavior. Its three components were group problem-solving and self-control skills training, group parent training and family counseling, and individual befriending through a big brother or big sister type of relationship. The main admission criterion was police contact within 6 months before the referral. Data were analyzed descriptively, through a survival analysis focusing on when specific events such as arrest occurred, and through Cox regression analyses. Results revealed that the probabilities for a male and female to have court contact by age 18 were 65.9 percent and 32.9 percent, respectively. The clinician's rating of the child's likability was a significant predictor of an early age for first court contact for males; a history of abuse was a significant predictor for females. Findings indicated the need for effective early identification programs for certain children and their families. Tables, figures, notes, and 37 references (Author abstract modified)