This book synthesizes the best of the new research related to anxiety disorders and how they are classified and diagnosed. Dr. Dean McKay and his co-editors have brought together leading authorities from multiple theoretical traditions to present the new directions and perspectives in the field of anxiety research. The contributors also discuss why current classification systems are inadequate, and what revisions should be made. The book presents in-depth discussions of how anxiety disorders are understood and assessed, as well as potential new implications for DSM-V. Key features: Covers the existing descriptive approach to the study of anxiety disorders, its adequacy in diagnosis, and its limitations Discusses the major theoretical and methodological approaches used to assess anxiety, such as fear circuitry, taxometric methods, actigraphy, neuroscience, and behavioral genetics Reviews diagnostic and classification controversies that center on specific anxiety disorders, such as obsessive-compulsive disorder, social anxiety, posttraumatic stress disorder, and worry This book covers the full spectrum of theoretical and empirical approaches used in the study, diagnosis, and classification of anxiety problems. In short, this volume serves as the authoritative reference book on the conceptualization and diagnosis of anxiety disorders.