Every person develops certain habits and rituals. This is important and meaningful because these habits relieve us of everyday decisions. Therefore, one only speaks of an obsessive-compulsive disorder if these rituals take up several hours a day, the execution of life is clearly impaired and important tasks in professional and private life can no longer be mastered. The updated edition of the guidebook offers a professionally well-founded description of the various forms of compulsions, illustrated with numerous case studies. The new edition provides information on the development of obsessive-compulsive disorders, with special emphasis on characteristics of stability and maintenance as well as networking in the lives of those affected. The guidebook describes the treatment of obsessive-compulsive disorders, especially with strategies of cognitive-behavioural therapy, which can be described as.