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Which measure did knowledge engineers use to judge whether a prototype was worth continuing?

  • A.Its performance on a small set of representative cases
  • B.The number of rules it contained relative to the number the expert had originally estimated
  • C.The speed of its inference engine
  • D.The proportion of the domain vocabulary that had been captured in the frames written so far

Answer: A

A prototype of perhaps fifty rules was run against a handful of carefully chosen cases, and its behaviour on those decided whether the domain and the representation were viable. Rule counts, engine speed and vocabulary coverage measure effort rather than competence, and a system can accumulate all three while still answering badly. Judging by case performance early, before large investment, is the practical discipline that the rapid prototyping style of development was built around.

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