A consecutive series of six adolescents referred for obsessive compulsive disorder were treated using a cognitive behavioural approach that included procedures intended to: (1) reach a shared understanding of the psychological nature of the problem; (ii) normalize intrusive thoughts; (iii) help the patient to reappraise notions of responsibility; and (iv) help the patient re-evaluate the basis of their fears. The effects of treatment were measured using standardized questionnaires designed to elicit beliefs about responsibility, and symptoms of anxiety, depression, and obsessive compulsive disorder. During the course of treatment, appraisals of responsibility changed at the same time as changes in symptom levels. The results suggest a more cognitive approach to treatment can be helpful for this age group, and that cognitive change is associated with clinical improvement.