This acclaimed work provides a systematic, comprehensive, and balanced evaluation of the current status of all major psychotherapeutic approaches. With a primary focus on adults, detailed evidence is presented for the efficacy of widely used interventions for frequently encountered mental disorders and specific populations. The book also explains the concepts that underpin psychotherapy research, examines methodological challenges in translating research into practice, and considers the impact on outcome of factors common to all therapies, such as therapist and patient characteristics.