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Functional correctness: Checks whether each function works according to the specification. Can be tested at any level (unit, integration, system). Functional completeness: Checks whether all required functions are implemented, usually during system or system integration testing, sometimes using the specification or legacy system as a reference. Functional appropriateness: Checks whether the functionality meets user needs and is suitable for its intended use. Typically done in system testing or later stages, often from a user perspective.
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