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A collaboration diagram describes interactions among objects in terms of sequenced messages. The collaboration diagrams represent a combination of information taken from class, the sequence, use case diagrams describing both the static structure and dynamic behavior of a system.

Collaboration Diagram Notations:

Class roles

Class roles describe how objects behave. To use the UML object symbol to illustrate class roles, don't list object attributes.

Association roles

Association roles describe how an association will behave given a particular situation. So we can draw association roles using simple lines labeled with stereotypes.


Unlike sequence diagrams, collaboration diagrams do not have an explicit way to denote time and instead number messages in order of execution. The Sequence numbering can become nested using the Dewey decimal system. As an example, nested messages under the first message are labeled 1.1, 1.2, 1.3, and so on. Condition for a message is usually placed in square brackets immediately following the sequence number. Use a * after the sequence number to indicate a loop.

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