Introduction and Historical Overview -- Part I. Psychotherapy approaches -- Behavior Therapy -- Client-Centered Therapy -- Cognitive Therapy -- Emotion-Focused Experiential Therapy -- . Interpersonal Psychotherapy -- Psychodynamic Therapy -- Acceptance and Commitment Therapy -- Brief Strategic Family Therapy -- Personal Construct Therapy -- Part II. Client populations -- Older Adults -- Couples -- Families -- Part III. Specific problems -- Borderline Personality Disorder -- Chronic Depression -- Chronic Pain -- Eating Disorders -- Low Self-Esteem -- Obsessions and Compulsions -- Psychosis -- Sexual Dysfunction -- Substance Abuse -- Traumatic Brain Injury -- Part IV. Directions for research, practice, and prevention -- Directions for Research on Homework -- Directions for the Integration of Homework in Practice -- Directions for Homework in Psychotherapy Prevention.