System Sequence Diagram Vs Sequence Diagram. Sequence diagram model before code. Sequence diagrams can be somewhat close to the code level so why not just code up that algorithm rather than drawing it as a sequence diagram.
System sequence diagram a system sequence diagram ssd illustrates input and output events. Sequence diagrams can be somewhat close to the code level so why not just code up that algorithm rather than drawing it as a sequence diagram. Sequence diagram is mainly used to represent the time order of a process.
Non coders can do sequence diagrams.
An ssd shows for one particular scenario of a use case the events that external actors generate their order and inter system events the system is treated as a black box ssds are derived from use cases. Activity diagrams is used to describe the general sequence of actions for several objects and use cases. Later we come to design each subsystem namely each element participating in the system use case diagram. Sequence diagram is an interaction diagram that details how operations are carried out what messages are sent and when.
