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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 software requirements definition document should be a functional requirements definition for the software. It should be based on the business functional requirements definition document. The business functional requirements definition document must be formally documented and signed by the business sponsors of the project. The software requirements definition document must be formally documented and signed by project stakeholders.