Minicourse, "Effective Teaching," a program of skills development, was designed to aid inservice training of elementary teachers. Fifty-two teachers in 13 widely distributed New York schools participated in the program on a voluntary basis. Thirteen Minicourse sessions were completed according to a timetable. Each instructional sequence required 1 week for participating teams to complete. A follow-up study, during the second semester, provided materials for each participating teacher in six schools. The primary source of data was three recorded teaching episodes, 15 minutes in length, which were collected prior to the beginning of the Minicourse program, at the end of the program, and at the end of a 6-month period following the program. Results indicated that teachers' behavior changed in directions intended by the Minicourse program and that the qualitative changes were well beyond the level required for statistical significance. Appendixes of related program materials and tables are included. (MJM)