Discussion
Why did expert systems prove difficult to maintain?
Answer: A
Once a system contains thousands of rules, adding or changing one can have unforeseen consequences elsewhere, and no expert has a global view of the interactions. Knowledge acquisition also proved to be a bottleneck, since experts often cannot articulate what they know. Hardware, cooperation and deployment were secondary difficulties. A system whose behaviour emerges from many local rules is hard to reason about globally, which is a difficulty shared with modern learned systems for different reasons.
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