A model for courses in which media are used has been designed by a research group at the Royel Institute of Technology in Stockholm. The model suggests that instruction be planned for in weekly packages. These should include a limited number of instructional aids, should begin with a motivating section, and should offer training in the solving of problems. A certain amount of skill training should be included in every weekly package, and feedback in the form of diagnostic tests should be frequent. This model is now being used in a new course on electronics, prepared with the cooperation of a number of Swedish agencies. Instructional media used in this course include tape recordings, radio, slides, a students' workbook, laboratory experiment sets, a teachers' guide, and a textbook. The diagnostic tests are manually checked by the teacher during the class period on prepunched reply cards; then these cards are sent for computer checking and statistical analysis. The results of the diagnostic test can thus have a direct influence on the instruction in the classroom. The course has proved to be a strongly motivating factor for the subject of electronics--this applies to its effect on the teachers as well as on the students. It is thought to be a step in the development of computer-managed instruction (CMI). (MF)