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    UML Activity Diagram


    I'm having a little trouble creating a UML activity diagram.

    As far as I understand it, activity diagrams can model a user's activities involving a system, and can model a system's activities which are activated by a user. Thus, would it be appropriate to do the following:
    Code:
    User              | System
                      |
    (enter details)<--|-->(retrieve details)
                      |
    etc.
    Where User and System are swimlanes.
    Where (enter details) and (retrieve details) are activities.
    Where <-----> represents two arrows: ------> and <-------.

    Or must one represent the User's activities and System's activities in two separate use case diagrams?

    Thanks for any help
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    Anyone?

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