On Chaining

One of the recurring topics in the rules world is forward chaining vs. backward chaining – how they compare, when to use one or the other, and which implementations even offer back chaining. I suspect that a lot of the confusion around backward chaining is simply due to the fact that most folks haven’t implemented production-quality systems that make use of it.

One of the forward vs. backward articles is by Dietrich Kappe. In his posting, he includes a quote from Charles Forgy, including the following:

Backward chaining systems are more limited than forward chaining systems.

Dietrich points out that the article was located on the old Rulespower site and disappeared with the purchase by Fair Isaac.

I’m posting here simply to point out that the Wayback Machine has them.

Charles Forgy on Forward and Backward Chaining

I have linked directly to the latest archived version of each article segment. You can find all the RulesPower content that they have here.

For further reading on the topic, the discussions at the following links are interesting (in no particular order):

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One response to “On Chaining”

  1. […] Backward Chaining: the ‘Bound Variable' pattern Karl posted on forward and backward chaining at http://karlreinsch.com/2010/01/07/on-chaining/. I emailed him privately and talked a bit about how backward chaining can be implemented on […]

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