Chapter 12. Communication Diagrams
Communication diagrams, a kind of interaction diagram, emphasize the data links between the various participants in the interaction. Instead of drawing each participant as a lifeline and showing the sequence of messages by vertical direction as the sequence diagrams does, the communication diagram allows free placement of participants, allows you to draw links to show how the participants connect, and use numbering to show the sequence of messages.
In UML 1.x, these diagrams were called collaboration diagrams. This name stuck well, and I suspect that it will be a while before people get used to the new name. (These are different from Collaborations [page 143]; hence the name change.)
Figure 12.1 shows a communication ...
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