只有范围和详细的程度有区别。
不同项目之间的用例建模有着显著的不同；用例的定义、用例的关系、详细的程度等等都是经常被争论的。
Use-case modeling varies significantly from project to project; the definition of a use case, use-case relationships, level of detail, and so on, are all subject to debate.
因此过程描述的详细程度可以变化。
Therefore, the level of detail in the process description can vary.
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