The transformation of knowledge bases from one expert system tool to another raises several issues: transformation of the syntax, adaptation to a different inferencing procedure, conservation of the knowledge, testing and evaluation of the transformed knowledge base, and its comparison to the original. The solutions for these issues were developed during the transformation of six expert systems originally developed with PC+, a parameter-driven expert system tool and one expert system developed with KES-HT, a hypothesis and lest expert system tool, into a forward-chaining pattern-matching tool: CLIPS.
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