Before revision: In software engineering and systems engineering, a functional requirement defines a function of a system or its component, where a function is described as a summary (or specification or statement) of behavior between inputs and outpuRequirements - Writing Requirements |title=Airborne Electronic Hardware Design Assurance: A Practitione
After revision: In software engineering and systems engineering, a functional requirement defines a function of a system or its component, where a function is described as a summary (or specification or statement) of behavior between inputs and outputs.