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Which property allows an expert system to be extended incrementally?

  • A.The inference engine recompiles the whole knowledge base whenever any rule has been changed
  • B.The shell is written in C
  • C.Each new rule is tested against the complete set of stored cases before it is finally accepted
  • D.Rules are declarative and independent

Answer: D

Because a rule states a relation rather than a step in a procedure, adding one does not require rewriting anything else, which is what let knowledge bases grow through use. Recompilation, implementation language and regression testing are engineering practices rather than the enabling property. The qualification is that interaction through working memory erodes the independence as the base grows. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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