The Obsessive Compulsive Disorder (OCD) Program - A Randomised Controlled Trial comparing clinician-assisted Internet based treatment for OCD vs. a waitlist control condition on severity of symptoms of OCD.

Participants will be randomly assigned to one of two groups: 1) Treatment with clinician-assisted Internet based Cognitive Behavioural Therapy for Obsessive Compulsive Disorder (OCD), or 2) Waitlist control. All participants will meet Diagnostic and Statistical Manual of Mental Disorders 4th Edition (DSM-IV) criteria for OCD. All group 1 participants will separately complete 6 lessons of Internet based treatment about the management of symptoms of OCD. One lesson will be completed every 7 to 14 days (it will become available after the preceding lesson has been completed, with a minimum of 7 days between lessons and a maximum of 14 days). Each lesson will take about 15 minutes to complete. Group 1 participants will have access to summaries of each lesson, homework exercises, extra resources, weekly reminder emails, and one-on-one contact with the Clinician (Clinical Psychologist) by telephone or email in the first 2 weeks, then as required. The duration of the program is 8-10 weeks, but participants will be contacted 3 months post program and asked to complete follow-up questionnaires. Study questionnaires will be administered at application, pre-treatment, mid-treatment, post-treatment, at 3 months post-treatment, and the K10 pre-each lesson. These will take about 20 minutes to complete. The treatment materials are based on cognitive behavioural techniques.