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Wikipedia “Non-Functional Requirement” ⇒ “A requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors.”
(Follow a pattern of [Tag Alias] Imperative Verb Phrase describing a Quality, a Non-Functional Desirement or Requirement.)
Relate the Quality with one or more of the Capabilities by citing the handles of those capabilities.
[FUNC-PERF-100] Response time [FUNC-PERF-200] transaction rate
Source: here