Where to Find Out More

Both the User Guide [Booch, UML user] and the Reference Manual [Rumbaugh, UML Reference] have more information on state diagrams. Real-time designers tend to use state models a lot, so it's no surprise that [Douglass]) has a lot to say about state diagrams, including information on how to implement them. [Martin] contains a very good chapter on the various ways of implementing state diagrams.