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Glossary
abstract class
A class that cannot be instantiated because a method (an implementation) has not been
specified for every operation of the class. See also operation and method.
abstract data type
A class created to encapsulate a type of information common to an application. It is often
used for items such as addresses, which contain a number of individual fields combined in a
specific way and edited according to rules unique to that combination. See also encapsulation.
abstraction
A unique representation of a real-world entity. The intent of the representation is not a
comprehensive description, but rather a description that is useful for a specific application
or purpose. For more information see Session 1.
abstract operation
An operation without an associated method (implementation). See also operation and
method.
action
A response to an event in a Statechart diagram, typically part of the transition from one
state to another and typically atomic (cannot be broken into subtasks). See also event and
Statechart.
action state
A condition in an object where it is occupied with the execution of an atomic behavior. An
activity in an Activity diagram represents an action state.