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Hi, could any one tell me how to model selection in communciation diagrams.

I know sequence is achieved by numbering the messages and iteration with (*).

Thanks.

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— good to hear you sorted it out. For anyone else who needs a concise how-to: model conditional (selection) behavior on a communication diagram by attaching guard conditions to the message labels. Put the boolean or predicate in square brackets before the message, for example [isValid] processOrder() and [not isValid] rejectOrder() so the reader can see which message fires under which condition.

If you need mutually exclusive branches, give each alternative its own guarded message. Some UML tools also let you use interaction operands/combined fragments (the UML "alt"/"opt" style), but support for those constructs in communication diagrams varies — they are more commonly applied in sequence diagrams. If your tool does not render fragments in a communication view, keep your guards short, add a clarifying note, or move complex branching into a sequence diagram for clarity. See the UML interaction semantics in the specification for precise rules and examples OMG UML 2.5.1 and a practical writeup on communication diagrams at Visual Paradigm Communication diagram guide.

Troubleshooting tip: if the diagram becomes cluttered, simplify guard expressions, annotate with notes, and validate the interaction using your tool so the intended control flow remains unambiguous.

Member Avatar for Cerberus

I've worked out what i needed to do. Sorry...

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