This paper outlines the instructional systems model developed by the Korean Educational Development Institute (KEDI). Before discussing the system itself, the speaker outlines the Korean mastery learning strategy on which it is based. The mastery learning approach has nine phases: diagnosis of learning deficiency, compensatory programs, presentation of instructional objectives, teacher instruction, formative tests, remedial programs, enrichment programs, cooperative learning activities, and summative tests. While the mastery learning strategies address only the teaching/learning aspect of education, the KEDI instructional program model was developed as a subsystem of the total educational system. The KEDI model addresses itself to the five steps involved in instruction for a learning task: planning, diagnosis, teaching/learning, extended learning, and evaluation. The speaker discusses outcomes of the program's four tryouts and the cost implications of the program. (Author/IRT)