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Why must concurrent durative actions be checked for interference?

  • A.One may violate a condition another requires throughout
  • B.Concurrent actions always take longer than sequential ones
  • C.The planner cannot compute the total duration otherwise
  • D.Durative actions cannot be executed by a single agent

Answer: A

If one action requires a resource throughout its interval and another consumes it midway, the two cannot overlap even though neither alone is faulty. That check is the temporal analogue of the planning graph's mutex relations. Duration arithmetic, total time and execution agency are different concerns. Interference between overlapping activities is the characteristic difficulty of concurrency wherever it appears.

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