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State Transition Diagrams (STD's)

An STD  is a way of describing the time-dependent behaviour of a system. The basic consistency rule is: "A system's behaviour in any state must be the same no matter by which path the state is arrived at".

States:

Transition conditions:

Transition actions:

Drawing STD's:

The classical elevator example:

STD's:

liftdoor

A graphical tool is used to produce the diagrams: TCM ( http://wwwhome.cs.utwente.nl/~tcm/ )
Page last changed on: Thu Jul 8 1999