Concurrency in Collaboration Diagrams

• Concurrency is expressed by different names instead of numbers at the same level of the decimal classification

• Synchronization is expressed by message numbers preceding a slash

:Oven

:Robot

currentJob

:TransferJob

:Factory

Scheduler

:Factory

JobMqr

job

1:start(job)

A2,B2 / 2:completed(job)

:FactoryManager

A2:completed

1 / A1:start(job)

B2:completed

1 / B1:start(job)

[cf.: Rumbaugh

et al., 1999]

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