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What is a causal link in a partial order plan?

  • A.A dependency between two variables in the domain
  • B.A link from an action to whichever goal it eventually achieves
  • C.A record that one action achieves a precondition of another
  • D.An ordering constraint between two actions in the plan

Answer: C

The link records that a particular action supplies a particular condition needed by another, so any action threatening that condition must be ordered outside the interval. It is what makes threats detectable. Bare orderings carry no such information, and the other options describe different relations. Recording why an ordering exists, rather than only that it does, is what allows the planner to detect when it has been violated.

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