The Children’s Summer Treatment Program (STP) is a comprehensive intervention for children with attention-deficit/hyperactivity disorder (ADHD) and related disruptive behaviors. The program focuses on the child’s peer relations, the child’s academic/classroom functioning, and the parents’ parenting skills–three domains that drive outcomes in children with these conditions. The STP is based on the premise that combining an intensive summer treatment program with a follow-up program during the school year is more likely to provide an effective intervention for ADHD than clinic-based treatment alone. Children entering grades 1-6 are treated for 6-9 hours daily, 5 days per week, in a camp-like setting in which they engage in a variety of recreational and classroom activities. During the 8-week program, multiple strategies are implemented, including a point system with associated rewards and consequences, sports skills training and practice, group problem solving and social skills training, and a Daily Report Card for assessing each child’s targeted behaviors. Ideally, treatment is conducted by a team of undergraduate interns (4 or 5 per group of 12-16 children) trained and supervised by staff with STP experience from the implementing organization, but staff may provide the treatment themselves if the use of interns is not possible. Parents attend weekly evening sessions in which they learn behavior management skills to apply to their children in the home setting. A teen version of the program also has been developed for adolescents entering grades 7-10.