Abstract
The APL-based system for Computer Aided Instruction described in this paper is presented as a general purpose system having interest in its own right, and also as an illustration of a “structured” approach to the solution of a relatively complex computing problem. The system meets the more or less mandatory requirement that neither the student user nor the teacher who creates the CAI instructional material should be required to know APL; but the main features are the ease with which a CAI lesson can be created, edited, and modified by a teacher, the “transparency” of the APL system with respect to a student user, and a “modular” design which permits modifications of the system to be made easily. A student employs only one APL function, and there are four functions used in writing the text. Also, in files there are related sets of permanent control functions, and functions and variables related to the text material, which exist in the active workspace only while the system is in use. The system includes a capability for monitoring the progress of students.
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