The authors investigated how well 52 internal medical residents understood the four modes of the interpersonal process recall (IPR) system after the students had received training in this system, and also investigated whether the students taught by instructors trained in the IPR system had a greater understanding of the system than those taught by nontrained instructors. Students were tested before and after the course, which involved extensive use of videotapes of interviews. With some reservations, the data as a whole suggest that the IPR system can be taught effectively by an enhancement of the methods used for this study and that the instructors do not have to receive training in the system to teach it effectively.