What are the optional pieces of information that can accompany a transition?

The optional pieces of information that can accompany a transition include the trigger name, guard, and effect name.

In modeling, particularly within the context of state machines, transitions are the connections between states that define how and when a system moves from one state to another. The trigger name refers to the event that initiates the transition. This could be an action or occurrence that prompts the transition to take place. The guard is a condition that must be true for the transition to occur, adding a level of control to the transition process. The effect name describes what happens as a result of the transition being taken.

This combination allows for greater specificity when defining the behaviors of a system as it transitions between states. By providing this optional information, modelers can create more precise and meaningful representations of system behavior, which can aid in understanding and implementing complex systems.