From a practical point of view, to estimate effort using use-case points, the use cases and the class diagrams must have been created.

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Quizplus · Accepted Answer

Effort estimation using use-case points primarily relies on the details provided by the use cases themselves, such as the number of transactions or the complexity of the use cases, rather than requiring class diagrams. Class diagrams are more related to the design phase and are not a prerequisite for estimating effort using use-case points.

From a Practical Point of View, to Estimate Effort Using