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By its very nature, artificial intelligence is concerned with investigating topics that are ill-defined and ill-understood. This paper describes two approaches to expanding a good but incomplete theory of a domain. The first uses the domain theory as far as possible and fills in specific gaps in the reasoning process, generalizing the suggested missing(More)
This paper reports the results obtai ned with a group of 24 14-year-old students when presented with a set of algebra tasks by the Leeds Modelling System, LMS. These same students were given a comporoble paper-and-penci l test crud detailed interviews some four months later. The latter studies uncovered several kinds of student misunderstandings that LMS(More)
This paper reports a psychological study of human categorization that looked at the procedures used by expert scientists when dealing with puzzling items. Five professional botanists were asked to specify a category from a set of positive and negative instances. The target category in the study was defined by a feature that was unusual, hence situations of(More)
Reuse of knowledge bases and the semantic web are two promising areas in knowledge technologies. Given some user requirements, finding the suitable ontologies is an important task in both these areas. This paper discusses our work on OntoSearch, a kind of "ontology Google", which can help users find ontologies on the Internet. OntoSearch combines Google Web(More)
I n recent years, knowledge management has referred to efforts to capture, store, and deploy knowledge using a combination of information technology and business processes. 1–3 More specifically, organizations aim to acquire knowledge from valued individuals and to analyze business activities to learn from successes and failures. Such captured knowledge(More)
Despite extensive discussion in the literoture about the diagnosis and subsequent remediotion of students' errors, few studies have compared the effects of different styles of error-based remediotion. Swan (1983) found that a conflict approach (pointing out errors made by students and demonstrating their consequences) was more effective than simple(More)