Discussion
Which reasoning direction starts from the known facts?
Answer: A
Forward chaining is data-driven: it fires whatever rules the current facts enable and keeps going until nothing more can be concluded. It suits monitoring and configuration, where the data arrive first and the goal is unknown. Backward chaining works the other way, and abduction and means-ends analysis are different strategies again. Matching the direction to the shape of the task is the first design decision in building any rule-based system.
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