用例图经常被分组来显示涉众们的需求集合（请看图 1中的例子）。
Use case diagrams (see Figure 1 for an example) are often grouped to show a collective set of stakeholder needs.
您初始的需求是以高层用例的形式获得的，图2中显示了一个实例。
Your initial requirements are captured in the form of high-level use cases, an example of which is shown in Figure 2.
图5 B .分析师活动：跟踪到用例的需求或特性。
Figure 5b. Analyst activities: Requirements or features traced to use cases.
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