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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.
The term requirement has been in use in the software engineering community since at least the 1960s. According to the Business Analysis Body of Knowledge (BABOK), a requirement is: A condition or capability needed by a stakeholder to solve a problem or achieve an objective.