因为用例模型是从业务分析师的视角定义的，所以它提供了一种层次的抽象，对项目相关者来说是有用的沟通工具。
Because a use-case model is defined from a business analyst's view, it provides a level of abstraction that's a useful communication tool for project stakeholders.
此时通过执行某种级别的分析，可以创建并记录正式的用例模型。
With a level of analysis performed at this point, a formal use case model can be created and documented.
图9：用例分析模型，及其到其他模型元素的可追溯性链接。
Figure 9: the Use-Case Analysis model and its traceability links to the other model elements.
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