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Explain how System Sequence Diagram differ from Sequence Diagram Reminder - System Sequence Diagram (SSD) ;( ’; System crea! - - ) § i §>o | ' ' 1 changeName (studentiD, name) 4 « The systems sequence diagram (SSD) from l* Shows only a single object, :System analysis is expanded by adding a use case controller and then the domain classes for the use case + Messages and returns are added to the sequence diagram as responsibilities are assigned to each class + Simple use case might be left with two layers if the domain classes are responsible for database access. More complex systems add a data access layer as a third layer to handle database access Black Box Concept