IN A STUDY OF THE EFFECTS OF CERTAIN VARIABLES ON THE OUTCOMES OF A COURSE IN INTRODUCTORY PSYCHOLOGY, PRETESTS AND POSTTESTS WERE ADMINISTERED TO 180 STUDENTS IN FOUR PSYCHOLOGY CLASSES AND TO 50 OTHERS. VARIABLES WERE CLASS SIZE, INSTRUCTOR, AND LECTURE VS. DISCUSSION METHOD, AND THE TESTS WERE MEASURES OF CHANGES IN STUDENTS' SELF-CONCEPT, SELF-ACCEPTANCE, CONCEPT OF IDEAL SELF, DEGREE OF PERSONAL ADJUSTMENT, AND KNOWLEDGE ABOUT PSYCHOLOGY. DATA INDICATED THAT THE INTRODUCTORY PSYCHOLOGY CLASS IS INSTRUMENTAL IN INFLUENCING PERSONAL ADJUSTMENT AND THAT AUTHORITARIAN ATTITUDES CAN BE MODIFIED IN A PERIOD OF LESS THAN A SEMESTER, WHILE THE STUDENTS IN THE CONTROL GROUP DID NOT CHANGE IN THESE RESPECTS. IN GENERAL, HOWEVER, METHOD OF INSTRUCTION, CLASS SIZE, AND DIFFERENCES AMONG INSTRUCTORS DID NOT APPEAR TO BE IMPORTANT VARIABLES IN PRODUCING AFFECTIVE CHANGES, NOR DID ACADEMIC MASTERY OF THE SUBJECT MATTER OF PSYCHOLOGY APPEAR RELATED TO THESE VARIABLES. (AL)