People with obsessive-compulsive disorder are significantly limited in their daily lives, and their social contacts are affected in various ways. In addition to treating the obsessive symptoms, social adaptation training is also important. The treatment of obsessive-compulsive disorders requires careful planning and targeted knowledge about the disorder. This behavioral therapy manual, consisting of 26 sessions, provides therapists with a practical, well-structured guide for treating obsessive symptoms as well as for social adaptation training. It can be applied in both individual and group settings and allows for considerable flexibility within the session structure to adapt to the individual needs of the patients. Contents include: - Fundamental knowledge about the disorder - Psychoeducation - Behavioral analysis - Exposure with response prevention - Flexibility training - Interpersonal skills.