  notion of non-functional requirements
In software system engineering, a software requirement that describes not what the software will do, but how the software will do it. Examples include software performance requirements, software external interface requirements, software design constrains, and software quality attributes. Non-functional requirements are difficult to test; therefore, they are usually evaluated subjectively
[Thayer90]
[Chung91,93]
» See also: contribution types
» See also: softgoal dependency
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