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Welcome to my tutorial on UML 2.0 Sequence Diagrams! Sequence diagrams model interactions in your program and provide you with a logical way to layout your system. They are about showing the order of interactions between the parts of your program.
In making sequence diagrams, you describe which interactions are triggered and when. They focus in on the order of events in all interactions.
The video covers just about everything and the cheat sheet above is there to re-enforce the specifics.