Recognized in its first edition as the only textbook to present a truly biopsychosocial approach, Barlow and Durand's groundbreaking text is rapidly becoming the standard by which other texts are judged. In this Second Edition, David Barlow and V. Mark Durand offer a consistent organizational structure that makes the material easy to learn, fascinating real-life cases integrated into the flow of each chapter, a mix of clinical and scientific approaches, a conversational writing style, and a variety of new built-in study aids designed to make the Second Edition easy to learn from and easy to use. Throughout the Second Edition, the authors' class-tested integrative approach helps students understand how each disorder is determined by multiple forces: biological, psychological, cultural, social, familial, and environmental.