Definition   CLASSIFICATION is the process of grouping objects having like properties (structural and behavior) into sets.

Definition   A set of objects grouped together as a result of classification is called a CLASS .

Definition   An individual element of a class is referred to as an INSTANCE of the class.

Definition   An OBJECT,  in the abstract,  is a collection of ``parts'',  ``behaviors'',  and ``relations''.

Definition   For practical programming purposes,  an OBJECT is either a class or an instance of a class.

Definition   A class is sometimes referred to as a STATIC OBJECT .

Definition   An instance of a class is sometimes referred to as a DYNAMIC OBJECT .