PST: What CHUNKS are

When Soar does not know what action to take next, it arrives at an impasse and thus creates a sub-goal whose goal it is to resolve the impasse. Chunks summarise the processing required in order to solve such sub-goals. They take the form of rules, and are placed in production memory such that if Soar encounter the same situation again, the chunk fires, avoiding the need for a sub-goal to be created.

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