Stepped Care Cognitive Behavioral Therapy for Pediatric Obsessive Compulsive Disorder

Below is a summary of assessment and interventions as part of the study (separated by condition). Two thirds will receive SC-CBT, one-third standard CBT (determined at random following the initial phone screen). A. Phone Screen (with parent) B. Informed Consent and Initial Assessment C. Randomization to either SC-CBT or Standard CBT D. Treatment Phase (either 1 or 2 determined at random following 'C') 1. SC-CBT Children who are randomized into SC-CBT will receive Step One: * 3-in-office sessions - 1 hour each (over 6 weeks) * 6 weekly phone calls (15 minutes or less) * Post assessment (at the end of the 6 weeks) * 3-month follow up Children are "stepped up" to Step Two of SC-CBT if we determine more therapy is needed (following the post assessment). Step Two is a continuation of therapy and will include: * 9-in-office weekly sessions - 1 hour each (over 9 weeks) * Post assessment (after session 9) * 3-month follow up OR 2. Standard CBT Children who are randomized into the standard CBT group will receive: * 12-in-office weekly sessions - 1 hour each (over 12 weeks) * Midpoint Assessment (after 6 weeks) * Post assessment (at the end of the 12 weeks) * 3-month follow up