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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.
Ideally, the technical requirements should give an insight as to what is being required basically from the client. More of the technical stuff just makes the requirement a constraint over the system. Most of the technical requirements can be converted to functional requirements by very good questioning.