Object Model Diagram. In this chapter robert martin explains a phonebook is connected to many phonenumber objects. An object model diagram shows the interaction between objects at some point during run time.
These shapes are then connected by lines that show the relationship between objects. An object model is part of the object oriented programming oop lifecycle. Object diagrams are vital to portray and understand functional requirements of a system.
Visually they resemble a simplified class diagram.
In the object model diagram a class is shown as a rectangle with three sections for the name attributes and operations. An object diagram is a structural diagram which uses notation similar to that of class diagrams. These shapes are then connected by lines that show the relationship between objects. Object based data models are based on above concept.