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What is a subgoal?

  • A.A goal generated at random to explore the search space
  • B.A condition that must be established to prove the current goal
  • C.A goal of lesser importance than the main one currently being pursued
  • D.A goal that has already been proved earlier in the search

Answer: B

Backward chaining replaces a goal by the conditions of a rule concluding it, and those conditions become subgoals to be proved in turn. The recursion terminates at facts or fails. Importance, prior proof and randomness are different notions. Decomposing a problem into the conditions that would settle it is the same reduction that appears in planning and in problem solving generally.

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