Parent/Child diagrams (again)

[GOCE]

I want to describe a system and its subsystems. I start with a context diagram like this: (images are not in EA)


Then I want to have a new diagram (a child diagram) where there is a decomposition of the ProcessBox in two new processes, like this:


As you can see the data flow arrows are the same, in the first case they are from the parent process, in the second case from one of its subsystems

Is there a way to do somenthing like this in EA?

P.S. I tried to use the function Composite, but I can't change the arrows 's "from" in the subsystem diagram

[qwerty]

Probably you need to draw flows from system and subsystem. In the 2nd diagram you need to hide the flows from the subsystem.

q.

[KP]

The problem that EA has is that in your first diagram Data0 has its source at ProcessBox0 but in the second diagram its source is SubProcessBox1. EA won't consider them the same flow.

Try having a Port on the edge of ProcessBox0. Then you would have a flow from SubProcessBox1 to the Port and from the Port to ExternalEntity0. Both flows would be called Data0. In your context diagram, you don't show the internal wiring of your process, and in your decomposition you don't show the external context, but in both diagrams you will show a flow called Data0.

[Tip: to show the Ports on the child diagram, drag the process element onto the child diagram, right-click > Advanced > Show Composite Diagram to show a diagram frame and right-click > Embedded Elements to show the ports.]

[GOCE]

ok, thank you for the answer...
I'll try it and see what can I do...

[GOCE]

Can you tell me which are the functionalities of the Port? What does it do exactly?
thank you again!

[qwerty]

A port is just that what the name says. You can use it to group a number of interfaces. See it as a plug which combines a number of different male/female connectors.

q.