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What is forward chaining in a rule based system?

  • A.Applying rules in the order in which they were written
  • B.Deriving every consequence as new facts arrive
  • C.Working backwards from a query to the facts supporting it
  • D.Chaining rules together into longer composite rules

Answer: B

Forward chaining is data driven, firing every rule whose conditions are met and adding the conclusions, which suits a system reacting to a stream of observations. Backward chaining is goal driven and does less work when only one question matters. Rule composition and textual order are different notions. Matching the direction of inference to whether data or questions arrive first is a decision that can change the work done by orders of magnitude.

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