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Which reasoning direction starts from a goal?

  • A.Conflict resolution, which chooses among the rules that are eligible to fire
  • B.Backward chaining
  • C.Forward chaining, which fires every rule whose conditions the current facts already satisfy
  • D.Breadth-first search

Answer: B

Backward chaining takes a hypothesis, finds the rules that would conclude it and tries to establish their conditions in turn, asking the user when nothing else will settle them. It suits diagnosis, where the candidate conclusions are few and known in advance. Forward chaining, search order and conflict resolution are separate notions. The characteristic question-asking style of a diagnostic consultation falls directly out of this control regime.

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