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The scope of a use case diagram is typically per-system. One of the symbols used on a diagram is called the "system boundary box". This is simply a box drawn around use cases and labeled with the system name. If further detail is needed, the same notation can be used to provide subsystems within a system by drawing a box around the use cases that are part of ...


Either activity diagram or sequence diagram (they are pretty much two views of the same thing). (EDIT: whoops in earlier text I was confusing correlation diagram with activity diagram; they are really similar. Either it's been too long, or else there are just too many damn diagrams available. ;) ) Sequence diagrams have notation for looping; the message ...

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