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transition
subject			fact

transition	has definition A change of state in response to an event
	is a subtopic of 8.2 - State Diagrams
	is represented by transition symbol in a state diagram
	is a kind of event
	may be triggered by a condition becoming true
	may be triggered by an event
	occurs instantaneously
	represents a change of state in response to an event
event	can cause a system or object to change from one state to another

Kinds of transition :

• elapsed-time transition (4 facts) - A transition that occurs in a state diagram due to the passage of a period of time
• transition in a state diagram (3 facts)
• transition in an activity diagram (3 facts)