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Visual Modeling with Rational Rose 2002 and UML by Terry Quatrani

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State Transitions

A state transition represents a change from an originating state to a successor state (which may be the same as the originating state). An action can accompany a state transition.

There are two ways to transition out of a state—automatic and nonautomatic. An automatic state transition occurs when the activity of the originating state completes—there is no named event associated with the state transition. A nonautomatic state transition is caused by a named event (either from another object or from outside the system). Both types of state transitions are considered to take zero time and cannot be interrupted. A state transition is represented by an arrow that points from the originating state to the successor state.

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