The 13 chapters of part 2 address the treatment program. The 12-to-20-session approach involves four phases: psychoeducation, cognitive training, mapping obsessive-compulsive disorder, and graded exposure and relapse prevention. The treatment is clearly explained, step by step and session by session, with one chapter devoted to most sessions. The authors' treatment approach is creative, flexible, developmentally appropriate, and systemic. For example, Michael White's strategy (2) of externalizing the problem is an integral component of their treatment.