context diagram

基本解释

The context diagram and the activity diagram are not necessary, but help you visualize the use case and its position in the project.
环境图和活动图不是必须的，但是可以帮助你可视化用例和它在项目中的位置。
A context diagram is a part of a use case diagram showing the relationships of this particular use case to actors and other use cases.
环境图是用例图的一部分，向参与者和其它用例显示了特殊用例之间的关联。
With the system context diagram and the information flows, you can define a rigorous system context document that will prove to be very important in shaping the software architecture of the system.
通过系统上下文关系图和信息流，您可以定义严格的系统上下文文档，这些文档在形成系统的软件架构方面非常重要。