Minicourse 4 on interaction analysis, an autoinstructional package based on the use of microteaching and the videotape recorder, was designed (1) to train teachers to categorize their own classroom behavior, using Flanders' system, to an 80 percent correct criterion level; (2) to increase frequency in classroom discussions of category 2, 3, and 4 behavior and decrease category 5 behavior, i.e., shift teacher behavior in the direction of indirect teaching; (3) train teachers in the fundamentals of matrix analysis and its possible significance. The course consists of seven instructional sequences taking approximately 15-16 days. Instructional materials include closely integrated handbook and videotape materials for use in developing coding procedures and model clips illustrating teacher strategies for use in presenting rationale for behavioral change. After preliminary field testing, the main field test was conducted using 24 teachers (volunteers) from whom videotaped discussion lessons were collected before and after the course. Findings: (1) Coding accuracy was 60-70 percent at a 5-second pace. (2) The second objective was achieved, the change appearing to be more a result of instructional lessons than microteaching. (3) Teachers were inadequate in interpreting matrices. Minicourse 4 will be revised to allow more time for coding more training clips and more training in matrix analysis. (Course outline and complete findings are included.) (JS)