title: Problems of evaluative research into group phychotherapy outcome.
mesh_terms: D001291:Attitude of Health Personnel; D001294:Attitude to Health; D002986:Clinical Trials as Topic; D004992:Ethics, Medical; D005069:Evaluation Studies as Topic; D006801:Humans; D007398:Interpersonal Relations; D009042:Motivation; D010044:Outpatient Clinics, Hospital; D010551:Personality; D011581:Psychological Tests; D011615:Psychotherapy, Group; D012649:Self Concept; D012919:Social Behavior