The initial state (state: The period of time during which an actor exhibits a particular behavior.) is the state of an object before any events in the diagram have acted upon it.
A state represents an instant in the life of an object (object: Represents a view of a directory service class. Objects represent specific network resources and have values assigned to their properties.). Double-click a State shape to add a name and list its internal actions and activities.
Transitions (transition: An allowed path from one state to another.)Transitions indicate that, in response to an event, an object will go from one state to another and perform an action.
The event (event: In a statechart or activity diagram, an occurrence that triggers a transition. When in a given state or action state, an object waits for an event to go to a different state.) which triggers the transition is named in the transition string. Double-click a transition to label it with a string that, in addition to an event signature, can also include a guard condition (guard: In a statechart or activity diagram, a condition that specifies when an event can take place. Whenever its event fires, a guard is evaluated only once.), an action expression, and more.