This is an informative article about the behavior therapies and their various approaches to the problem of theory and clinical work. The existing behavior therapies are organized around the required therapeutic operations and divided into four major paradigms: 1, interactive therapy in which the doctor-patient relationship is the tool for initiating behavioral change; 2, instigation therapy in which the doctor makes specific suggestions to the patient about controlling or modifying particular behavior; 3, replication therapy in which behavior is simulated in the office and the patient has the opportunity to try new responses that the therapist can re-enforce; and 4, intervention therapy in which a specific symptom is kept under attack by the therapist in an attempt to alter the frequency of response by learning theory methods. Each paradigm is then examined in further detail and discussed in learning theory terms of re-enforcement, extinction, and generalization.