This book represents a compilation of years of theoretical and clinical insights distilled into a specific theory of disturbance and therapy and deductions for specific clinical strategies and techniques. It focuses on an explication of the theory, a chapter on basic practice, and a chapter on an in-depth case study. A detailed chapter follows on the practice of individual psychotherapy. Using rational emotive behavior therapy (REBT) in couples, family, group, and marathons sessions is highlighted. The book commences with a note on the general theory underpinning the practice of REBT, outlines its major theoretical concepts and puts forward an expanded version of REBT’s well-known ABC framework. It then considers aspects of the therapeutic relationship between clients and therapists in REBT, deals with issues pertaining to inducting clients into REBT, and specifies the major treatment techniques that are employed during REBT. A number of obstacles that emerge in the process of REBT and how they might be overcome are noted. The book then distinguishes between preferential and general REBT (or cognitive-behavior therapy [CBT]) and specifies their differences. Individual, couples, family and group therapies are explained. The book talks about the Rational Emotive Behavioral Marathon, a highly structured procedure that is deliberately weighted more on the verbal than on the nonverbal side. The authors’ 8-week psychoeducational group for teaching the principles of unconditional self-acceptance in a structured group setting is described. The book concludes with a discussion on the concept of ego disturbance, REBT treatment of sex difficulties using the cognitive-emotive-behavioral approach, and REBT’s effectiveness with hypnosis.