Some systems or objects can be in different states.
A kettle may be full or empty, on or off, cold or
hot, and the state will change under the influence
of outside circumstances, or simply the passing of
A State Transition Diagram shows each state as a
location, and the transitions between them as
arrows. Each arrow is labelled with the reason
for the state transition. Thus we can follow
the status of the system as different stimuli
arrive, because the same stimulus may have different
effects according to the state the system is in
at the time it arrives.
The MM STD is an example of a State Transition Diagram.
In it the states are the current setting of the
juggler's arms. Crossed left over right, uncrossed,
or crossed right over left, and the transitions
between them are the kinds of throws that can be
made from that state.
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