When comparing a use-case description to a use-case diagram for functional model verification and validation, there must be ONE and ONLY ONE use-case description for each use case, and vice versa..

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A use-case description provides a textual description of a use case, while a use-case diagram provides a graphical representation of the use case. Each use case should have one and only one use-case description, and vice versa, to ensure that the functional model is accurately represented and validated.

When Comparing a Use-Case Description to a Use-Case Diagram for Functional