What does a state transition diagram illustrate?

A state transition diagram is a visual representation of how an object changes from one state to another in response to various events. It captures the dynamic behavior of the system by mapping out all possible states an object may occupy and the transitions triggered by events.

In the context of systems analysis and design, understanding how an object changes states based on events is crucial for modeling the behavior of complex systems. Such diagrams help in designing systems that need to react to specific inputs or changes in conditions, thus allowing for a clear depiction of the life cycle of an object within the software.

The focus of a state transition diagram is on the events that cause transitions between states, providing clarity on the conditions under which these transitions occur. This makes it an essential tool for analyzing systems where objects must adapt or respond to varying inputs or situations throughout their lifecycle.