Object Orientation Terminology Matrix

Terminology Matrix

E&Y/ NSS	OMG2	C++	Smalltalk	Odell/ Martin	Booch	Rumbaugh	ER Model
Object	Object	Object	Object	Object	Object	Object	Entity instance3
Class	Class4	Class	Class	Concept6 Object Type6 Class5	Class	Class	Entity type3
Attribute	Attribute Property	Attribute	Instance variable	Attribute type function	Attribute	Attribute	Attribute
Subclass	Class7	Derived class	Subclass	Subclass Subtype	Subclass	Subclass	Subtype3
Super-class	Class7	Class	Class	Super-Class Supertype	Super-Class	SuperClass	Supertype3
Method	Operation Method8	Member Function	Method Operation	Method8 Operation8	Method Operation	Method8 Operation8	n/a

This table indicates correlations among terms that are in many cases only analogous rather than equivalent.

Object Management Group, which is a consortium of companies who have banded together to, among other objectives, define standards for various aspects and applications of object-orientation.
Entity/Relationship models only data and not behaviour.
A Class classifies objects according to a common implementation. A Type classifies objects according to a common interface.
A Class is the implementation of an Object Type or Concept.
Concept is synonymous with Object Type
The notion of conformance facilitates the hierarchical arrangement of objects.
A Method is the code that implements an Operation.