Family responses to OCD have gained great attention over the past decade, and predict treatment outcome. This symposium represents leading clinical researchers investigating the impact that OCD has on family and how family responses play an important role in treatment outcome for both pediatric and adult samples. Newly validated instruments for measuring family accommodation will be discussed, as well as how accommodation predicts treatment outcome. Strategies for family-based intervention will be suggested, including novel family approaches for intensive OCD treatment and how to advise family when the person with OCD refuses treatment. A brief presentation by each expert will be followed by a discussant summary and audience Q&A.