In a clear, concise paper, Ackerman discusses in satisfying detail the technique, indications and contraindications for group treatment. He considers it 'a more real experience than individual therapy', and 'less bound to the irrationalities of the unconscious'. It should be viewed as an independent therapeutic technique and not as a substitute in competition with individual treatment. It is of little value for those with chronic rigid personality distortion with deep unconscious roots and is of particular value for those cases in which the conflict is between the individual and his environment. The emphasis in treatment is on the pathology of social behavior rather than on more purely intrapsychic sources of tension. The criteria for the selection of patients for group therapy are outlined in the paper, which is strongly recommended to those interested in the subject.