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Why is plan quality often traded for planning speed?

  • A.Optimal plans cannot be computed for any realistic domain
  • B.The quality of a plan cannot be measured objectively
  • C.Executing a plan always costs more than computing it in every case
  • D.A slightly longer plan executed sooner is usually preferable

Answer: D

In most applications a plan five per cent longer, available in a second rather than an hour, is plainly the better outcome, and weighted search provides a bound on the loss. Optimal plans are computable for small problems, quality is measurable by plan cost, and execution cost varies. Choosing the quality actually required, rather than the best obtainable, is a decision that should be made deliberately rather than by default.

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