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A diagnostic system asks a user for a laboratory result, and the user types WHY.

Which component produces the response, and what does it say?

  • A.The acquisition module, offering to let the user add a rule that would settle the question
  • B.The explanation facility, naming the rule that needs the answer
  • C.The inference engine, listing every rule that remains eligible to fire at this moment
  • D.Working memory, listing the facts so far

Answer: B

A WHY query is answered by the explanation facility, which names the rule whose condition the question is trying to establish, and repeated WHYs climb the goal stack towards the top-level hypothesis. The engine, working memory and the acquisition tools do other jobs. The facility turns what would otherwise feel like an arbitrary interrogation into a visibly purposeful line of enquiry.

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