A new edition of the most respectived textbook in behavior therapy. Each chapter has been thoroughly revised and expanded to reflect the most current research and latest developments in the field. Enlarged discussion of behaviorial assessment and ethical issues. Extensive new coverage in all areas, both practical applications and theoretical issues. New Index of Disorders makes it easy to locate discussion of the various techniques and used to treat a specific disorder. Chapters have been slightly reorganized so that self-control procedures now conclude the text. Clear writing style and careful balance between clinical prodedures and research results have been retained. Third Edition includes new chapter on behavioral medicine, one combined chapter on contingency management, and greater coverage of cognitive techniques.