In the last decade, tremendous progress has been made in understanding and addressing Generalized Anxiety Disorder (GAD), a prevalent yet long-neglected syndrome associated with substantial functional impairment and reduced life satisfaction. This comprehensive, empirically based volume brings together leading authorities to review the breadth of current knowledge on the phenomenology, etiology, pathological mechanisms, diagnosis, and treatment of GAD. Provided are psychological and neurobiological models of the disorder that combine cutting-edge research and clinical expertise. Assessment strategies are detailed and promising intervention approaches described in depth, including cognitive-behavioural, interpersonal, psychodynamic, and pharmacological therapies. Also covered are special issues in the treatment of GAD in children, adolescents, and older adults.