State Machine Specification--General Tab

Figure 48 State Machine Specification--General Tab

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Statechart Diagram Overview

Statechart diagrams model the dynamic behavior of individual classes or any other kind of object. They show the sequences of states that an object goes through, the events that cause a transition from one state or activity to another, and the actions that result from a state or activity change.

Statechart diagrams are closely related to activity diagrams. The main difference between the two diagrams is statechart diagrams are state centric, while activity diagrams are activity centric. A statechart diagram is typically used to model the discrete stages of an object's lifetime, whereas an activity diagram is better suited to model the sequence of activities in a process.

Each state represents a named condition during the life of an object during which it satisfies some condition or waits for some event. A statechart diagram typically contains one start state and multiple end states. Transitions connect the various states on the diagram. As with activity diagrams, decisions and synchronizations may also appear on statechart diagrams.