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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.
1. Define Functional Requirements. Requirements Definition is an art and a science. It requires analysts to work very closely with customers and to draw on their communication and technical skills to surface underlying business needs that might be addressed by a system solution.