Pass information among activity diagrams

[Alberto]

Hello everybody,

More general questions about activity diagram:

- Is it reasonable to use activity diagrams as alternatives to state machines?

- It there a standard way to pass information between activity diagrams (e.g. using ports of Internal block diagrams)? 

Thanks

[István Dányi]

Hi Alberto,

1) Activity vs. state machines

Though both model elements are a behaviour element, they are used for different specific perspectives. Therefore, I would say, the situation (behaviour type) determines which of them is more suitable. IOW, you can model an activity behaviour with a state machine, and vice versa, but only one of them is appropriate in a given context. State machines focus on stable statuses and events triggering transition between these statuses; activity is rather a sequence of steps following each other along some decision rule as their executions are completed.

2) Pass information between activities

I suppose you mean activity rather than activity diagram, but I am not sure what you are looking for. There are two approaches: you can call a sub-activity by a CallAction and passing parameters; or you can send and receive async messages by SendObjectAction/SendSignalAction and AcceptEventAction. Both approaches provide a way to pass information between activities (not activity diagrams).

hope it helps,

Istvan

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