Discussion of explanations and knowledge representation within knowledge-based systems focuses on the development of an expert system for purification of proteins in a Swedish laboratory. Topics include domain conceptualization; a multiple-explanation construction model; a study of laboratory staff that investigated construed explanations; and…

Presents a framework characterizing cognitive models generated by sixth-grade students for simple opening/closing control mechanisms, like the elevator door. The students' conceptions, missing conceptions, and misconceptions are analyzed at three levels: device knowledge; perception of the control process; and perceptions of information flow. (LAM)

Analyzes students' visual renderings of concepts related to the term "hypermedia" to determine whether groups, membership of which was based on a mixture of learning styles or a mixture of hypermedia knowledge, constructed concept maps that differed in terms of several factors. Learning style seemed to explain the types of interactions more than…

Discussion of hypermedia, memory, and metacognition focuses on a study of graduate students that examined how hypermedia instruction can influence structures of knowledge, format selection for graphical descriptions of hypermedia-related information, hypermedia knowledge, concept-map complexity, and metacognitive accuracy. Future research is…