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What is a durative action?

  • A.An action whose effects persist indefinitely once applied
  • B.An action that takes longer to plan than to execute
  • C.An action occupying an interval rather than an instant
  • D.An action that may be repeated for as long as necessary

Answer: C

A durative action has a start, an end and conditions that may be required at either or throughout, which is what temporal planning adds to the classical formalism. Repetition, persistence and planning cost are different notions. Once actions occupy intervals, two of them may overlap, and the whole question of interference between concurrent actions arises, which is why duration is a substantial extension rather than a numeric annotation.

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