Discussion
Which weakness is meant by brittleness in an expert system?
Answer: A
A rule base encodes surface associations without the underlying model, so a case just outside its coverage produces a confident wrong answer rather than an admission of ignorance. Human experts degrade gracefully instead. Editing conflicts, firing order and speed are engineering issues. Brittleness motivated both model-based reasoning and the very large common-sense knowledge bases attempted afterwards. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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