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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 functional specification (FS) is a formal document that details all features and specifications of a certain software product. During the requirements phase of the software development process, a functional specification is one of the key documents created by a manager or lead developer. Hence, the functional specification should contain enough detail for the developers to begin the design of the project and thereafter to begin coding.