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  • Elements of an activity diagram
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Overview
An activity diagram represents the behavior of a method or the flow of a use case.
For example, the following diagram presents the flow of a dam:
Elements of an activity diagram
An activity diagram includes the following elements:
  • activity: presents a specific step in a the execution of a mechanism. For example: "Print an estimate", "Open the window", "Check the knowledge, "...
  • synchronization bar: used to synchronize the different activities:
    • by indicating the activities that must be performed before a given activity. For example: "Press the clutch" and "Change gear" before "Releasing the clutch".
    • by indicating the activities that must be performed in parallel.
  • object: used to attach activities to the object that performs these activities. For example, the "Order" and "Pay" activities are attached to the "Customer" object; the "Teach" and "Check knowledge" activities are attached to the "Teacher" object.
  • sending signal: represents the sending of a signal toward an object.
  • waiting for signal: shows the wait for a signal coming from an object.
  • transition: represents the passage from a terminated activity to another one. For example: "Too much water", "Enough money", ...
  • package: divides and organizes the representation of the diagram (like the directories organize the files).
  • Versions 15 and later
    initial state: represents the status of the process before the activity starts. Several different initial states can be found.
    New in version 15
    initial state: represents the status of the process before the activity starts. Several different initial states can be found.
    initial state: represents the status of the process before the activity starts. Several different initial states can be found.
  • Versions 15 and later
    final state: represents the status of the process at the end of the activity. Several different final states can be found.
    New in version 15
    final state: represents the status of the process at the end of the activity. Several different final states can be found.
    final state: represents the status of the process at the end of the activity. Several different final states can be found.
See Handling an activity diagram for more details.
Minimum required version
  • Version 9
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