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Which advantage does a human expert retain over a rule-based system?

  • A.Speed on routine cases
  • B.The capacity to justify a conclusion by naming each of the steps that led towards it in order
  • C.Graceful degradation outside the familiar
  • D.The ability to apply a very large body of rules consistently over a long working day without error

Answer: C

A human recognises unfamiliar ground and reasons cautiously from first principles, whereas a rule base answers confidently or not at all. Consistency, tirelessness and speed favour the machine, and rule traces actually give better step-by-step justification than most experts produce. The asymmetry at the boundary of competence is the one that has proved hardest to eliminate.

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