From foremost authorities, this book provides fresh insights and practical tools for using cognitive-behavioral therapy (CBT) in treatment of obsessive–compulsive disorder (OCD). The authors explain the rationale for a cognitive approach focused on the meaning of intrusions and show how to use it as an alternative to or in conjunction with exposure and response prevention. Vivid clinical material illustrates assessment, case formulation, and intervention with frequently encountered OCD presentations (doubting and compulsive checking, classic obsessions) as well as less common presentations (mental contamination, moral scrupulosity, perfectionism). User-friendly features include boxed clinical tips, frequently asked questions, and reproducible/downloadable handouts and forms.