Subject: Object names in sequence/collaboration diagrams

> I have a question about the collaboration diagrams that we need to create
> for each use case from assignment 1.
> When a collaboration diagram involves another TCS's object (like in the
> request info use case and the negotiate use case) do I need also to put in
> the diagram the other TCS's control/boundary/entity objects.

Yes.  The messages in a collaboration or sequence diagram are between objects,
not classes.  One can any number of instances of each class.  In the solution,
I give some examples of it.  In each column there are two names:

  object-name : class-name

> For example: in the request info use case I need to check if the info is
> located on the local DB. if not then the system should query a remote DB. in
> this case we have a local and a remote entity objects and also a local and
> remote control objects (to handle the communication between the two TCS
> nodes). The negotiate use case has also these local and remote objects.
> Do I need to put all of these objects in the same collaboration diagram for
> a specific use case? or perhaps I need to create the diagram to show the
> collaboration of both the local and the remote TCS nodes using the same
> objects (without the local/remote notation).
> Can you give references to examples of collaboration diagrams on the net or
> other books. The book we are using doesn't contain these examples.

The solution shows how this is done.  Obviously, this will not count against
you in your solution.