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Broadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.roadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.
Many of the difficulties encountered in defining requirements relate to the functional-nonfunctional distinction. As so often happens, some of those difficulties are things of which people are aware, largely realizing after-the-fact that nonfunctional requirements were missed. Understanding functional and non-functional ...