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Typical uses:
UML-compliant flowcharts (decision branches and merges)
Business work flow modeling (sequence of actions)
Parallel process modeling (forks and joins)
Besides simple work flow modeling, activity diagrams demonstrate strength in support of parallel behavior, as typically found in the process modeling.
Activity diagrams could be used to describe a use case, but many domain experts don't follow activity diagrams easily...
...and we may be better off with the usual textual form of use case specification!
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