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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 system requirement is a description of the needs and desires for a system or application. A system requirement describes functions, features and constraints. Defining requirements is a primary function of a project manager but he or she isn't the only one actively involved in the process. During the requirements discovery process, project team members use fact-finding techniques to gain a better understanding of the requirements of the system.