What element follows the forward slash in a transition definition?

In a transition definition within a state machine model, the forward slash signifies the effect behavior associated with that transition. This effect behavior describes actions that occur when the transition is taken, usually following the completion of the exit actions of the source state and before any entry actions of the target state.

Effect behaviors can involve changes to the system state, invoking operations, sending messages, or updating variables. Understanding the role of these effect behaviors is essential for modeling dynamic systems, as they articulate what happens during a transition beyond just moving from one state to another. They play a critical role in how the overall behavior of a system is defined and realized in response to events.

On the other hand, the entry behavior of the target state, the exit behavior of the source state, and the signal instance received do not accurately describe the specific function that the forward slash represents in a transition definition. Instead, they refer to different aspects of state machine dynamics that are significant but distinct from the immediate actions taken due to the transition itself.