将各种协作工作者从模型树中拖动到图表中，从而描述实现该处理过程活动的任务序列。
Drag the various collaborating workers from the model tree into the diagram to describe the sequence of tasks that realize the process activity.
它们描述了一个迭代的，递增的，引导开发团队实现结果的过程，而不是为一个软件项目指示一个计划-建立-组装的活动序列。
Rather than prescribing a plan-build-assemble sequence of activities for a software project, they describe an iterative, incremental process that steers development teams toward results.
活动图：活动图提供对系统行为的视图，它描述了过程中的活动序列。
Activity diagram: An activity diagram provides a view of the behavior of a system by describing the sequence of actions in a process.
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