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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.
Functional requirements VS Technical requirements. 1  Any system that has to be built by an organization/company starts just as documents. This requirements documents are the ones that speak out the customer minds. 2  Not all requirements are going to be handled by the programmers and System Analysts alike.