The production system operates on a forward chaining recognize-act cycle:
All productions are matched against all data to find the set of all productions that are satisfied by some subset of the data. (The same production might be satisfied by multiple sets of data.) The set of satisfied productions with data bindings is sometimes called the conflict set.
The satisfied productions (or, in implementations on a serial machine, one of them) are fired, which means their actions are executed. The actions generally make changes in the working memory. Production systems thus normally operate in a forward-chaining fashion.
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