Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition

15.2. Example Collaboration Diagram: makePayment

The collaboration diagram shown in Figure 15.3 is read as follows:

1.	The message makePayment is sent to an instance of a Register. The sender is not identified.
2.	The Register instance sends the makePayment message to a Sale instance.
3.	The Sale instance creates an instance of a Payment.

Figure 15.3. Collaboration diagram.