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What is the difference between a functional requirement and a system requirement?
A functional requirement is the what; a system requirement is the how.
A functional requirement is what the system should do. It is what function is wanted. Non functional is how that is achieved. It specifies how that system should work.
A functional requirement describes the observable behavior of a system. It describes how the work should be done. A system requirement describes the needs of the system (computer) to be able to use the software or hardware. Some examples of functional requirement are “user must be able to login to their account” “user must be able retrieve password”. Some examples of system requirements are “the system must be able to operate in windows and Mac operating systems”