For example, the internal workings of a new payroll system would be shown in an activity diagram, whereas external actors, such as the mail order department, would appear in a use-case diagram.

• 例如，新的工资表系统的内部工作情况可以在动作图表中显示，而外部表演者，如邮购订单部门，将出现在使用案例图表）。