The Object model shows design mechanisms within an object-oriented design. Several modeling notations are available. UML Communication Diagram UML Communication (called Collaboration prior to UML 2.0) is a type of object interaction diagram that emphasizes the data links between participants. It is illustrated below with association lines drawn between objects and couples attached to the lines showing the name, direction and parameters of object operation calls. UML Sequence Diagram The UML Sequence diagram shows the same type of information, but it highlights the time sequence of object operations and events. Return to Software Models