I. The Nature of OCD 1. Diagnosis, Phenomenology, and Comorbidity 2. Obsessions, Intrusions, and Their Correlates 3. Compulsions, Neutralization, and Control II. Theory, Research, and Practice 4. Exposure Response Prevention: Theory and Practice 5. The Cognitive-Behavioral Model: Theory and Research III. Fundamentals of CBT for OCD 6. The Therapeutic Relationship 7. Assessment and Case Formulation 8. Goals, Education, and Cognitive Interventions 9. Empirical Hypothesis-Testing Experiments IV. Subtype Treatment Protocols 10. Contamination OCD 11. Doubt, Checking, and Repeating 12. Harm, Sex, and Religious Obsessions 13. Symmetry, Ordering, and Arranging