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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.
A Requirement specification is a set of documented requirements to be satisfied by a material, design, product, or service. A Functional specification is closely related to the requirement specification and may show functional block diagrams.