Sequence diagrams describe a specific scenario and not all the interactions that happen between the objects that form a system.

When we draw a sequence diagram, we represent a snapshot of a given part of the live, working system. Instead of having a huge sequence diagram describing every interaction between the objects, we create several targeted ones.

It’s like performing a cardiac CT-scan instead of scanning the entire body. If we’re only interested in the heart and its blood vessels, why should we examine the entire body?

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