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What is a state diagram?
A state diagram is the graphical representation of a state machine and one of the 14 UML diagram types for software and systems. State diagrams show a behavioural model consisting of states, state transitions and actions. UML state diagrams are based on the concept of state diagrams by David Harel. State diagrams depict the permitted states and transitions as well as the events that effect these transitions.
State diagrams depict the different states of a state machine.
They also depict the events effected by state transitions.
Why are state diagrams important?
State diagrams are irreplaceable when describing systems and system behaviour, for example electronic components such as control units for driver assistance systems in vehicles. For these systems permitted states are defined and visualized in state diagrams, as well as activities which are carried out in specific states or during the course of transitions.
ESP (electronic stability program) effects an intervention into the vehicle guidance if sensors transmit values (e.g. revolution speed, yaw rate) that deviate from specified values. The result is a state change of affected components such as vehicle brakes.
The benefits of state diagrams
State diagrams are the ideal way to model object life cycles. State diagrams enable you to describe the behaviour of objects during their entire life span. In addition, the different states and state changes as well as events causing transitions can be described. On other words: State diagrams make the system behaviour visible.
State diagrams show the states of an object
as well as the reasons for state changes.
Your state diagram is complete – what now?
When all states, events and transitions of your system or artefact have been defined the first step to successful systems development has been made. But this knowledge needs to be made available to your entire team. The way you process and work with this knowledge decides whether your project will be successful. The best way to make knowledge, information and project data availbale is a designated tool that lets you work together, collaboratively in your team, in real-time.