Architecting and designing : SysML : Model Elements : Block : State Machine
  
State Machine
SysML specifies several types of behaviors:
Activity
State Machine
Interaction
Opaque Behavior, which has subtype FunctionBehavior
A State Machine is a model of the States that an object can be in, and how it transitions to different States.
See also
Class
Activity
AssociationClass
FunctionBehavior
Interaction
OpaqueBehavior
Stereotype
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