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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 functional specification is also the basis for building the master project plan and master project schedule. After the customer and stakeholders accept the functional specification, the team baselines (places under change control) it and begins to formally track changes to it.