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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.
Editorial / Best Answer. BRD: Business Requirement document states about the high level business requirement along with the business need and business problem FRD: Functional Requirement document states about the functionality required in the application designed for the business problem and need mentioned in the Business requirement document. It mentions the Functional as well as Non functional requirements. Functional requirement are described with the help of Use case description and Use case diagram where as Non functional requirements like capacity, performance etc. are also mentioned. Hope this will help you.