To evaluate a standardized multicomponent cognitive behavioral treatment program for child and adolescent obsessive-compulsive disorder (OCD). The treatment program consists of individual Exposure and Response Prevention (ERP) for the OCD child plus a concurrent family intervention designed to reduce OCD-related family conflict, facilitate family disengagement from the affected child's OCD behavior, and rebuild normal family interaction patterns. The ERP/Family Treatment Program is compared with Relaxation Training (RT).