Collaboration Diagrams
The second form of the interaction diagram is the collaboration diagram.
Within a collaboration diagram, the example objects are shown as icons. As on a sequence diagram, arrows indicate the messages sent within the given use case. This time, however, the sequence is indicated by numbering the messages.
Numbering the messages makes it more difficult to see the sequence than putting the lines down the page. On the other hand, the spatial layout allows you to show other things more easily. You can show how the objects are linked together and use the layout to overlay packages or other information.
You can use one of several numbering schemes for collaboration diagrams. The simplest is illustrated in Figure 5-4. Another approach ...
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