Communication diagram

A communication diagram[1] in Unified Modeling Language (UML) 2.5.1 is a simplified version of the UML 1.x collaboration diagram.

[2] UML has four types of interaction diagrams: A Communication diagram models the interactions between objects or parts in terms of sequenced messages.

Communication diagrams represent a combination of information taken from Class, Sequence, and Use Case Diagrams describing both the static structure and dynamic behavior of a system.

Reading a communication diagram involves starting at message 1.0, and following the messages from object to object.

Communication diagrams show which elements each one interacts with better, but sequence diagrams show the order in which the interactions take place more clearly.