An experimental computer-assisted instructional (CAI) system is described. The first segment of the report discusses some basic considerations in the design of the system in which as many features as possible of a large-scale CAI system were implemented on a minicomputer. Aspects of the system which are elaborated upon include the PDP-11 computer and its peripherals, the key reader system and learning environment, the system input and output, the student record, the test file, the course definition language, the student progress report and input generation. Part two of the report describes two simulated multi-media courses in order to demonstrate the decisions which go into planning a course and to show how the course is utilized. (Author/PB)