Chapter 10. System Sequence Diagrams


In theory, there is no difference between theory and practice. But, in practice, there is.

 --Jan L.A. van de Snepscheut


A system sequence diagram (SSD) is a fast and easily created artifact that illustrates input and output events related to the systems under discussion. They are input to operation contracts and—most importantly—object design.

The UML contains notation in the form of sequence diagrams to illustrate events from external actors to a system.


UP artifact influence emphasizing system sequence diagrams ...

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