The prevailing view among both therapists and clients is that a more vital life can be attained by overcoming negative thoughts and feelings. Then why do so many people continue to suffer with behavior disorders, adjustment difficulties, and low life satisfaction? Acceptance and Commitment Therapy (ACT) is a unique psychotherapeutic approach that addresses this question by altering the very ground on which rational change strategies rest. Providing in one volume a scientifically sound theory of psychopathology and a practical treatment model, the book features detailed clinical guidelines as well as numerous case examples demonstrating the approach in action.