UML Activity Diagrams, Free Examples and Software Download
Edraw is ideal for software designers and software developers who need to draw UML activity diagrams
UML Activity Diagrams
UML Activity D iagrams is a special case of a statechart
diagram in which all of the states are action states and the transitions are
triggered by the completion of actions in the source state. Use an activity
to describe the internal behavior of a method and represent a flow driven by
internally generated actions.
UML Diagram Software and View All
In Edraw Professional, the UML Activity Diagrams template
and shapes are in the Software folder.
UML Activity Diagram Symbols
Edraw is an ideal software to draw UML activity diagrams.
Examples of UML Activity Diagrams
How to Draw UML Activity Diagrams
1. Identify the scope of the activity diagram
Begin by identifying what you are modeling. Is it a single use case? A
portion of a use case? A business process that includes several use cases? A
single method of a class? Once you identify the scope of your diagram, you
should add a label at the top, using a note, indicating an appropriate title for
the diagram and a unique identifier for it. You may also want to include the
date and even the names of the authors of the diagram.
2. Add start and end points
Every activity diagram has a starting point and an ending point, so you might as
well add them right away. In UML Distilled (see Resources), Fowler and Scott
make ending points optional. Sometimes an activity is simply a dead end but, if
this is the case, then there is no harm in indicating the only transition is to
an ending point. In this way, when someone else reads your diagram, he or she knows
you have considered how to exit these activities.
3. Add activities
If you are modeling a use case, introduce an activity for each major step
initiated by an actor (this activity would include the initial step, plus any
steps describing the response of the system to the initial step). If you are
modeling a high-level business process, introduce an activity for each major
process, often a use case or a package of use cases. Finally, if you are
modeling a method, then it is common to have an activity for this step in the
4. Add transitions from the activities
My style is always to exit an activity, even if it is simply to an ending point.
Whenever there is more than one transition out of an activity, you must label
each transition appropriately.
5. Add decision points
Sometimes the logic of what you are modeling calls for a decision to be made.
Perhaps something needs to be inspected or compared to something else. What is important
to note is that the use of decision points is optional. For example, in Figure 1,
I could just as easily have modeled the accepted and rejected transitions
straight out of the "Enroll in University" activity.
6. Identify opportunities for parallel activities
Two activities can occur in parallel when no direct relationship exists between
them and they must both finish before a third activity can. In Figure 1 you see
it is possible to attend the overview or enroll in seminars in either order, but
both activities must occur before you can end the overall process.
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