Event (UML)

An event in the Unified Modeling Language (UML) is a notable occurrence at a particular point in time.

Events can, but do not necessarily, cause state transitions from one state to another in state machines represented by state machine diagrams.

A transition between states occurs only when any guard condition for that transition are satisfied.

Unified Modeling Language

Actors

Organizations
- Object Management Group
- UML Partners
Persons
- Grady Booch
- Ivar Jacobson
- James Rumbaugh

Concepts

Object oriented	Object-oriented programming Object-oriented analysis and design Object-oriented modeling

Structure	Actor Attribute Artifact Class Component Interface Object Package Profile diagram

Behavior	Activity Event Message Method State Use case

Relationships	Aggregation Association Composition Dependency Generalization (or Inheritance)

Extensibility	Profile Stereotype

Other	Multiplicity

Diagrams

Structure	Class Component Composite structure Deployment Object Package

Behaviour	Activity State Machine Use case

Interaction	Communications Sequence Interaction overview Timing

Derived languages

Systems Modeling Language (SysML)
UML eXchange Format (UXF)
XML Metadata Interchange (XMI)
Executable UML (xUML)

Famous quotes containing the word event:

“... every event has had its cause, and nothing, not the least wind that blows, is accident or causeless. To understand what happens now one must find the cause, which may be very long ago in its beginning, but is surely there, and therefore a knowledge of history as detailed as possible is essential if we are to comprehend the past and be prepared for the future.”
—Pearl S. Buck (1892–1973)