要实现分析商店内的库存周转率用例，我们需要确定遗留源系统，在此情况下，是图3中的Store Sales数据库。
To implement the Analyze Stock Turnover Rates for a Store Department use case we need to identify the legacy source systems, in this case the Store Sales database of Figure 3.
在这个情况下，您应该尽力的识别已经被代码实现的特定特性，然后将这些特性映射到用例图。
In this case, you try to identify the specific features implemented in the code and then map them to the use cases.
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.
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