开发一个用户界面流程模型，显示在典型“会话”期间来自业务流程的给定参与者如何与系统相交互。
Develop a model of the user interface flow, showing how a given actor from the business process will interact with the system during a typical "session".
还有一个用斜体显示的特殊状态与业务流程相关联——因为给定的Actor可能与多个流程交互。
And yet another special state shown in italics is associated with the business process - since a given actor may interact with multiple processes.
在建模一个业务流程时，不为人工活动分配用户角色或仅仅给定一个默认值。
When modeling a business process, the human activity is not assigned a user role or is just given the default value.
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