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Which facility answers a user's question about the reasoning?

  • A.The knowledge acquisition module, which allows an expert to add and revise rules directly
  • B.The working memory
  • C.The conflict resolver, which decides which of the eligible rules should be fired next
  • D.The explanation facility

Answer: D

The explanation facility answers how a conclusion was reached and why a question is being asked, typically by walking the trace of fired rules. Its availability was a major reason users came to trust these systems, and it also served as a debugging aid for the knowledge engineer. Acquisition, memory and conflict resolution are different components. The facility is a direct benefit of keeping knowledge declarative. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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