What are state transition diagrams?

State Transition Diagram

A state machine is a thing (e.g., system, subsystem, component, unit) whose functionality and output is dependent not solely on its current path, but also on its past input

The result of its previous input is called its state, and transitions are commands that cause changes from one state to another

what is software quality?

There are two definitions by IEEE and ISO.

According to IEEE

• The degree to which a system, component, or process meets specified requirements

• The degree to which a system, component, or process meets customer or user needs or expectations

ISO says:

• The totality of features and characteristics of a product or service that bear on its ability to satisfy specified or implied needs.