此外，同样的类图也描述了在IaD活动中确定的每个用户目标和相应的系统参与者之间的关系。
Additionally, the same class diagram also describes the relationship between each User Goal identified during the IaD activity and the corresponding System Actor.
如果这个项目组织利用uml来建模，那么单元测试将需要序列图，类图，可能还会需要活动图。
If the project organization is using UML for modeling, unit testers will need sequence diagrams, class diagrams, and perhaps activity diagrams.
通过活动图可以清楚的描述类的行为。
The behavior of the class is described using an activity graph.
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