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What is plan length as a quality measure?

  • A.The number of actions the plan contains
  • B.The time the planner took to find the plan
  • C.The number of goals the plan achieves
  • D.The number of states the plan passes through

Answer: A

Counting actions is the simplest cost measure, and weighting each action by its own cost generalises it to problems where actions differ in expense. Planning time is a separate measure of the search rather than the plan, and the other options are different quantities. Distinguishing the cost of the plan from the cost of finding it is essential, since a planner may trade one against the other deliberately.

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