Reproduced here are symposia papers dealing with behavior theory and therapy. Behavior therapy attempts to apply the findings of experimental psychology and the laboratory to the clinic. It takes the principles of learning and scientific psychology and makes them useful therapeutically. The two orientations in this area are operant and classical conditioning principles used as therapeutic techniques. The writers deal with: (1) the learning theory approach to the treatment of childhood schizophrenia; (2) illustrations and reflections on operant conditioning in behavior therapy for children; (3) some methods of behavior therapy for neurosis; and (4) guided imagining in reducing fear and avoidance behavior. Pertinent references appear at the end of each section. (EK)