Discussion
Which practice reduces the risk that a knowledge base silently drifts out of date?
Answer: C
Annotating each rule with who supplied it, when and on what basis makes it possible to review the parts of the base a change in the domain has affected, instead of re-examining everything. Storage format and rule count do nothing for currency, and running the engine tests consistency rather than truth. Provenance is cheap to record at authoring time and almost impossible to reconstruct afterwards, which is why the discipline matters so much more in a knowledge base than in ordinary code.
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