如果想要了解一个重要的用例，用户则需要看到控制流程，在这种情况下，序列图是个不错的选择。
If he wants to understand an import use case, he would want to see the control flow, and would benefit from a sequence diagram.
然后基于用例图来设计测试路径，通过这些，所有相关关系和可能的选择至少要一次通过。
The test paths are then designed based on the use case diagram, through which all relevant relationships and possible choices are passed at least once.
所有内容都来自于工作说明，我们得到特性列表和用例图，分解问题，然后选择一个用例开始迭代。
All from a statement of work, we can derive the feature list and use case diagrams, break up the problem, and then pick a use case to start to iterate.
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