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  • Elements of a sequence diagram
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Overview
A sequence diagram represents the chronological order of messages sent and received by a set of objects.
For example, the following diagram represents the beginning of a phone call:
Elements of a sequence diagram
A sequence diagram includes the following elements:
  • object: represents the different objects used. Each object is represented by a square at the top of a dotted line. This line represents the lifespan of the object. For example: "Caller", "Callee", ...
  • activation period of an object: Activation periods can be inserted into the line representing the lifespan of an object. These periods represent the times when the object is active.
  • message: represents, via horizontal arrows, the message exchanged between the different objects. These arrows are oriented from the message issuer to the recipient. The order in which the messages are sent is given by the position of the arrows on the vertical axis.
    For example: "Hang up", "Ring", ...
  • package: divides and organizes the representation of the diagram (like the directories organize the files).
See Handling a sequence diagram for more details.
Minimum required version
  • Version 9
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