Answer 1) Use a use case diagram with a use case to represent 
your system and actors or entities as the external systems.

Answer 2) Rose does not (to my knowledge) support functional 
decomposition, so no you cannot check for consistency, unless 
you want to write your own script to do this.

Les.

> Hi all,
> 
> just some questions, maybe someone could help ...
> 
> - how could I use UML to represent all external data flow to 
a project ?
> (kind of context diagram, but exhaustive one, with an arrow 
for each
> data flow... ?)
> - when using this kind of diagram through Rose, is it 
possible to check
> the data flow consistency between diagrams (i.e. to check the 
data flow
> completion between an upper level context diagram and a lower 
level
> diagram )
> 
> Thanks n Regards,
> 
> BB


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