What is System Sequence Diagram ? – Definition from Trenovision

System Sequence Diagram

System Sequence Diagram [ SSD ] is useful to investigate and define the behaviour of the software as a “black box”.System behaviour is a description of what the system does (without an explanation of how it does it).



Use cases describe how external actors interact with the software system. During this interaction, an actor generates events.A request event initiates an operation upon the system.
 


SSDs for Process Sale Scenario

 

System Sequence Diagram
SSDs for Process Sale Scenario