WEEK 9 UML State Transition Machines

Flashcards to aid in understanding UML State Transition Machines, covering key terminology and concepts.

State Machine Diagram

A diagram used to model the possible states of a system or object, showing state transitions triggered by events.

Transition

The change from one state to another in a state machine.

Initial State

The starting point of a state machine diagram, where the system cannot remain and must transition to an active state.

Final State

A terminal state that marks the end of the sequence of states, where the object can remain permanently.

Event

An occurrence that can trigger state transitions; types include signal events, call events, and time events.

Guard Condition

A Boolean expression checked during a transition; if true, the transition occurs; if false, the event is discarded.

Activity

An action performed while in a state or during a transition.

Entry Activity

Actions performed when entering a state in a state machine diagram.

Exit Activity

Actions performed when exiting a state in a state machine diagram.

Decision Node

A pseudostate used to model alternative transitions based on conditions.

Synchronization Node

A pseudostate that merges multiple concurrent flows into a single flow.

Parallelization Node

A pseudostate that splits a control flow into multiple concurrent flows.

Signal Event

An event that represents the receipt of a signal.

Time Event

A type of event that triggers based on time conditions.

Deferrable Trigger

An event that does not trigger a state transition immediately but is available for processing when transitioning to a new state.

Completion Event

An event that is generated automatically when all actions in the current state have been completed.

Exogenous Stimulus

An event or signal that triggers a state transition externally.