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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.
Requirements are totally abstract things. A requirement is simply something that somebody requires. The Oxford English Dictionary defines a requirement as an order, a demand, an imperative. In the most common engineering context, a requirement is a required characteristic of something that is to be engineered or otherwise acquired. If a requirement is written down, it is now a specified requirement. A specification is a specific record. In the two most common engineering contexts, we have requirements specifications and design specifications. The first is a specific record of a set of requirements; the second is a specific record of a design.