Interventions that mobilize the parents to coach and reinforce their children's social skills have been shown to improve children's social functioning and decrease inappropriate social behaviors in the home and at school. However, few studies have examined whether these treatment outcomes can be successfully transferred from the research to the clinical setting. We examined the effectiveness of a 12-session manualized social skills intervention involving parent participation. As part of regular clinical practice, measures of children's social skills, self-control, and psychopathology were collected pre- and post-treatment. Findings suggest that parent ratings of children's social skills and self-control improved and aggressive behavior decreased.