In 1987-88 three small, rural elementary schools were demonstration sites for implementation of a computer-managed instructional (CMI) program. The schools were located in Anne Arundel County, Maryland; Palmyra, New Jersey; and northern York County, Pennsylvania. Implementation costs were supported by the school districts, federal grant money, and a CMI-system vendor. Implementation process involved: (1) negotiations with the school districts; (2) facilities modification; (3) hiring of full-time laboratory managers; (4) development of guides to correlate district curriculum objectives with CMI learning activities; (5) hands-on training of laboratory managers and teachers; (6) laboratory use by all regular students 30 minutes daily, in remedial summer programs, and in adult literacy instruction; and (7) planning for school district funding of program continuation. Program evaluation showed: (1) modest student achievement gains; (2) overwhelmingly positive student attitudes; (3) teachers' initial use of the system as a supplement; (4) widespread interest in exploring the system's capacity to individualize instruction; and (5) readjustment of the schedule of the school day, teachers' instructional sequences, and student grouping patterns. Recommendations for districts considering a CMI system are included. Appendices contain objectives in the basic skills for grades 2-6 (reading, language arts, and mathematics); student attitude surveys and item analysis; staff interview protocols; and a school observation form. (SV)