The methods and attributes (object variables) used by instances in a class are usually found at the class level. But sometimes an instance differs in some respect from the others in its class. It might perform an additional action or require some unique handling. In this case one or more methods and related attributes (object variables) can be added directly to the instance. These additional methods and attributes (object variables) form a separate scope, independent of the class scopes found throughout the rest of the hierarchy.
Methods can be added directly to an instance's collection of object methods using SETMETHOD, a method of the Object class. All subclasses of the Object class inherit SETMETHOD. Alternately, the Class class provides an ENHANCED method that lets you create new instances of a class, whose object methods are the instance methods of its class, but enhanced with the additional methods from a supplied collection of methods.