The authors have recently updated this concise, systematic guide on Rational Emotive Behavior Therapy (REBT). They discuss rational versus irrational thinking, the ABC framework, the three basic musts that interfere with rational thinking and behavior, two basic biological tendencies, two fundamental human disturbances, and the theory of change in REBT. A detailed case example that includes verbatim dialogue between therapist and client illustrates the 18-step REBT treatment sequence.