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A Non-Functional Requirement (NFR) is a type of requirement in software and system development that specifies criteria for the performance, behavior, and qualities of the system, rather than defining specific features or functionalities. Unlike Functional Requirements, which describe what the system should do, Non-Functional Requirements describe how the system should perform or behave.
This article is an introduction to a series that will show techniques to be used in modern software systems, blending together functional and object-oriented programming.
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