THIS REVIEW OF THE PROBLEMS IN DESIGN AND INTERPRETATION OF RESEARCH ON HUMAN RELATIONS TRAINING, PARTICULARLY THAT USING T GROUPS AND SENSITIVITY TRAINING, REFERS TO STUDIES IN THE FIELD. PROBLEMS CONSIDERED ARE--THE PROBLEM OF CONTROLS (VOLUNTEER PARTICIPANTS, PREDICTION OF OUTCOMES), TEMPORAL CHANGE IN TRAINING OUTCOMES (RELATIONSHIP OF CHANGE TO TIME), DIMENSIONS AND DIRECTIONS OF CHANGE, CLASSIFICATION SCHEMES FOR TRAINING OUTCOMES (NORMATIVE, RESTRICTIVE, PRESCRIPTIVE), VARIABILITY IN THE TRAINING EXPERIENCE (TRAINER STYLE, GROUP COMPOSITION), TIMING OF DATA COLLECTION (BY MAIL OR IN THE LABORATORY), EXPERIMENTER-PARTICIPANT RELATIONSHIPS IN THE LABORATORY SETTING, AND STATISTICAL PROBLEMS IN TRAINING RESEARCH. THE PAPER CONTAINS 14 BIBLIOGRAPHIC REFERENCES. IT WAS PRESENTED AT THE RESEARCH SEMINAR OF THE VETERAN'S ADMINISTRATION HOSPITAL (WEST HAVEN, CONNECTICUT, JANUARY 27, 1967). (AJ)