Discussing Controversial Issues (DCI) is a skill training program designed for high school students and teachers with an overall objective of developing student and teacher skill in discussing controversial issues effectively. The course materials identify 13 moderator techniques which teachers practice, and 13 participant techniques which students practice. Behavioral data were collected by audiotape recording a 25-minute classroom discussion on on a controversial issue both before and after the course. Questionnaires, vocabulary tests, weekly logs of issues, and classroom observation were utilized and inter-rater reliability was computed. Behavioral results for students and teachers are presented. Critiquers, students, and teachers each used the same scale to rate the discussion. Postcourse Teacher Questionnaires were filled out by the teachers and in general, strong support was given to the usefulness of the course. Overall, DCI produced an improvement in the use of discussion techniques. Because of feedback from students and teachers, several revisions will be made in the course materials and techniques. (RC)