UML sequence diagram

Date: February 1st 2016
Last updated: February 1st 2016

A UML sequence diagram illustrates interactions and processes between objects and events. Importantly, a sequence diagram maps out messages (communication) that are sent between objects over a time sequence.

Sequence diagrams:

  • Include two elements: messages and lifelines.
  • Messages annotate communication
  • Lifelines (annotated box with a hanging dashed line)
  • Lifelines point to boxes representing length of time
  • If theres no box, communication is idle
  • Solid arrows refer to method call
  • Dashed arrows refer to method return values

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