The hallmarks of this disorder are recurrent obsessions (persistent ideas, thoughts, and impulses or images that are unwanted and intrusive) and compulsions (repetitive behaviors - hand washing, ordering, checking or counting) . These behaviors occur so frequently or are so severe that they cause distress. Depression is very common in people with this disorder. Onset can occur in young children. The disorder more commonly presents in childhood. The prevalence in adults is about 1%. The book Children With Obsessive Compulsive Disorder provides strategies for management for parents and teachers.