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What is a threat in partial order planning?

  • A.An action whose preconditions cannot be achieved at all
  • B.A goal that conflicts with another goal in the problem
  • C.An ordering constraint that creates a cycle in the plan
  • D.An action that could delete a condition a causal link protects

Answer: D

A threatening action deletes the protected condition and could fall between the producer and the consumer, so it must be ordered before the producer or after the consumer. Those two resolutions are called demotion and promotion. Unachievable preconditions, conflicting goals and cycles are different failures. A conflict detected structurally, with exactly two possible repairs, gives a clean branching point for the search.

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