Abstract
In many of the CAI lessons in use today, there is a strong emphasis on user interaction and the provision of immediate feedback from the lesson. This paper describes an example of the use of a “tiny tool” — a small language designed specifically to provide a vehicle for user interaction with the exercises in a COSTOC CAI lesson on matrix inversion. Such a language can be implemented as a “natural” user interface, if carefully designed; for some applications it is a more “natural” interface than the ubiquitous “menu driven” and “hypertext” interfaces. For this type of mathematical problem, in particular, it can allow the student to interactively solve matrix inversion problems, in the context of the CAI lesson, permitting immediate feedback. Moreover, it affords the designer of the lesson an opportunity to implement “non-trivial” exercises in a relatively simple way.
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