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  • 5.3 系统顺序图

    系统顺序图 System Sequence Diagram

       把待建系统看成一个黑盒子,研究参与者与系统边界的交互
       SSD

         System Sequence Diagram

       What is SSD

         A SSD is a picture that shows, for one particular scenario of a use case, the events that external actors generate, inter-system events , and their order

         All systems are treated as a black box

         the emphasis of the diagram is events that cross the system boundary from actors to systems

       System Event

         external input events

           actor generates events to a system

       system operation

         to handle the system event , for example

           when a cashier enters an item's ID, the cashier is requesting the POS system to record that item's sale (the enterItem event). That event initiates an operation upon the system

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  • 原文地址:https://www.cnblogs.com/mayZhou/p/10548295.html
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