If they do not, an exception is raised. Interruptible actions may be temporarily suspended. An action can be graphically represented in one of two ways. Second, it could be represented as an OSA model. Initial Transitions Initial transitions activate initial states.
Initial transitions have no prior states.
The transition takes place when its trigger is satisfied and a new thread of control is created. In multi-threaded systems, an initial transition may be triggered many times without worrying about other existing threads. Initial transitions can be graphically represented as a normal transition with no prior states. Figure S shows both types of initial transitions. Final Transitions Final transitions are transitions with no subsequent states.