Positive Affect Treatment for Depression and Anxiety: Therapist Guide is intended to be used by clinicians who are familiar with cognitive-behavioral therapy (CBT) generally and with clinical presentation of depression, anxiety and anhedonia. Results show that Positive Affect Treatment not only improves positive mood state but also decreases depression and anxiety. This guide will be an indispensable resource for all practitioners who wish to effectively and efficiently help individuals regain interest and enjoyment in their usual activities while improving their quality of life.