Object-oriented design (OOD) is a design method in which a system is modeled as a collection of cooperating Object (computer science) and individual objects are treated as instances of a Class (computer science) within a class hierarchy.

Four stages can be identified:

# Identify the classes and objects # Identify their semantics # Identify their relationships # Specify class and object interfaces and implementation

Object-oriented design is one of the stages of object-oriented programming.

=Literature=