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Sequence Diagrams on Prepare Itinerary (part II)

 
Francesco Marchioni
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Hi all SCEA folks,
I have just started working with part II. I'm beginning with prepare Itinerary Sequence Diagram.
The diagrams shows the interaction between user who buys the ticket and system.

Customer selects ....
System responds....
Customer selects...
System responds...
Customer selects...
System responds...

until the ticket is purchased or cancelled.

I took a look at Curt's Smith example project and I can see
that there are only Customers inputs (-----> . There are no
System returns (<-----) after each operation.
The only System return is found in the end, where the ticket is
bought.

I feel a bit confused.
Should I include system "returns" after each operation( for example system returns flights availables, then seats available, etc.), or only in the
end ?

I hope I have been clear
Thanks
Francesco
 
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