The Interface System is a comprehensive method for developing and managing computer-assisted instructional courses or computer-managed instructional courses composed of sets of instructional modules. Each module is defined by one or more behavioral objectives and by a list of prerequisite modules that must be completed successfully before the specific module can be attempted. The system's key components are: 1) a standard general structure for all modules; 2) a consistent method of labeling logic and text elements; and 3) computer programs (presently written in COURSEWRITER with Assembly Language functions) to regulate inter-module student traffic and to execute system-controlled and student-controlled instructional decisions. (PB)