Discussion
Which activity checks that the system was built correctly?
Answer: B
Verification asks whether the knowledge base is internally sound, free of conflicts, redundancy, circularity and unreachable rules. Validation asks the different question of whether its answers are right, usually by comparing them with experts on test cases. Elicitation and maintenance are separate phases. The pairing of the two questions, building it right against building the right thing, is worth memorising in this form. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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