An experimental course in introductory psychology at Georgetown University utilizes principles of operant reinforcement to modify verbal behavior in the classroom situation. The major facet of the program is a student-student interview. Interviews are scheduled after each student reads a portion of the assigned text. One student, the listener, times and listens to the speaker without comment. When the speaker concludes, the listener, familiar with the material comments on the presentation. If both students are satisfied that the interview shows mastery of the text, results are recorded on a class chart. At the end of each chapter (three to five interviews), the student takes a written exercise. Student-instructor conferences are held after each written examination, and remedial procedures discussed if necessary. There was one lecture a week, and a final examination was given. Students progressed through the course at different rates, but the overall frequency of interviews increased as the course progressed. The interview, in addition to maintaining student activity in the class, also served to reinforce study behaviors which produced well verbalized interviews. Informal contact with the teaching staff also contributed to each student's identification with the course. (SK)