UML Collaboration Diagrams
1. Introduction
A contract for system operations describes what the system operation does, but it does not show a solution of how software objects are going to work collectively to fulfill the contract of the operation. The later (how) is specified by an interaction
diagrams in UML. A major task of the design phase is to create the interaction diagrams for the system operations.
Source: Ellen Ambakisye Kalinga, https://oer.avu.org/bitstream/handle/123456789/667/CSI%203104_EN%20Object%20Oriented%20Analysis%20and%20Design1.pdf?sequence=1&isAllowed=y
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