This groundbreaking book explains the "whats" and "how-tos" of metacognitive therapy (MCT), an innovative form of cognitive-behavioral therapy with a growing empirical evidence base. MCT developer Adrian Wells shows that much psychological distress results from how a person responds to negative thoughts and beliefs -- for example, by ruminating or worrying -- rather than the content of those thoughts. He presents practical techniques and specific protocols for addressing metacognitive processes to effectively treat Generalized Anxiety Disorder, Obsessive-Compulsive Disorder, Posttraumatic Stress Disorder, and major Depression. Special features include reproducible treatment plans and assessment and case formulation tools, plus a wealth of illustrative case material.