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Glossary Page



The observable effects of an operation or event, including its results.

behavioral diagram

A diagram that depicts the behavioral features of a system or business process. Behavioral diagrams include Activity diagrams, State Machine diagrams, Communication diagrams, Interaction Overview diagrams, Sequence diagrams, Timing diagrams and Use Case diagrams.

behavioral feature

A dynamic feature of a model element, such as an operation or method.

behavioral model aspect

A model aspect that emphasizes the behavior of the instances in a system, including their methods, collaborations, and state histories.

binary association

An Association between two Classes. A special case of an N-ary Association.

Contrast: n-ary association


The creation of a model element from a template by supplying arguments for the parameters of the template.


A marker in a Rich Text Format document that enables you to link inner sections of a document into a master document (using the Word 'Insert File' function).


An enumeration whose values are true and false.

boolean expression

An expression that evaluates to a boolean value.


  1. A stereotyped Class that models some system boundary typically a user interface screen. It is used in the conceptual phase to capture user interaction with the system at a screen level (or some other boundary interface type). It is often used in Sequence and Robustness (Analysis) diagrams. It is the View in the Model-View-Controller pattern.
  2. A System Boundary element is used to delineate a particular part of the system.