An interactive, multimedia text for calculus instruction that contains the entire contents of a corresponding textbook is evaluated and found to have features that enhance concepts with dynamic examples of graphs and problems that make good use of animation, audio, and video. Its design accommodates diverse student abilities and educational…

PLUS, an authoring system designed to develop cross-platform courseware for different computer types, was evaluated for its portability (ability to run on multiple platforms without adjustment). The procedures and computer equipment used are described, and results are presented. It is concluded that PLUS produces highly portable programs. (MSE)