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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.
However, what exactly is the difference between âfunctionalâ and ânon functionalâ requirements? Itâs not that complex, and once you understand the difference, the definition will be clear. The official definition of âa functional requirementâ is that it essentially specifies something the system should do.