交互图是用于交流在用例实现团队会议中出现的设计思想的非正式文档。
Interaction diagrams are informal documents used to communicate design ideas that come up during the use-case realization team sessions.
图23：根据用例将实现类分组。
图24：根据用例合职责将实现类分组。
Figure 24: Grouping implementation classes by use cases and responsibilities.
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