Compares the strengths and weaknesses of four authoring systems that can be used for courseware development: (1) Quest; (2) PCD3; (3) IconAuthor; and (4) Course of Action. Evaluation procedures used to assess their power, ease of use, and productivity aids are explained; menu and icon structures are described; and interactive design implications…

Describes Pathfinder, a microcomputer software package designed to improve students' understanding and skills in interpreting graphs of physical phenomena which was tested in high school math classes. Differences in strategies between various ability levels are reported, and student interactions based on observations and interviews are discussed.…