This is a completely revised edition of the book which was the first to explain to the general reader what group psychotherapy is, how it works, and what it aims to effect by way of treatment. Two pioneers of the psychoanalytic approach to group therapy outline, with the help of clinical illustrations, the ways in which patients who are emotionally disturbed can help to rub the corners off one another in the course of free floating discussion. The psychodynamics of open and closed groups the patterns of relationship which develop and the role of the therapist are all clearly describes.