In Rexx, methods are usually associated with instances using classes, but it is also possible to add methods directly to an instance using the setMethod or enhanced method.

All subclasses of the Object class inherit SETMETHOD. You can use SETMETHOD to create one-off objects, objects that must be absolutely unique so that a class that is capable of creating other instances is not necessary. The Class class also provides an ENHANCED method that lets you create new instances of a class with additional methods. The methods and the object variables defined on an object with SETMETHOD or ENHANCED form a separate scope, like the scopes the class hierarchy defines.