This chart illustrates the items comprising a State machine. The items are:

• States
• Transitions
• Conditions ( events)
• Entry actions

The convention is that at in each moment during the operation, the system must be in exactly one of the states, called the Active State.

The active state changes occasionally, in response to events. The changing of the active state is called "transition". The event triggering the transition is called "condition".

Updated on 07 May 2016.