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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.
This article is about product and process development. For other kinds of requirements, see Need and Intelligence requirement. In product development and process optimization, a requirement is a singular documented physical and functional need that a particular design, product or process must be able to perform.his article is about product and process development. For other kinds of requirements, see Need and Intelligence requirement. In product development and process optimization, a requirement is a singular documented physical and functional need that a particular design, product or process must be able to perform.