Definitions Edit

A non-functional requirement

specifies a particular quality of the system rather than a function of the system. Two kinds of non-functional requirements are typically distinguished: 1. Execution qualities observable at run-time such as security, availability, reliability, etc.; 2. Evolution qualities observable at design time such as scalability and extensibility.[1]
specif[ies] criteria useful to evaluate the qualities, goals or operations of a system, rather than specific behaviors or functions of a system.[2]
is a statement that specifies a constraint about how a system must behave to meet functional requirements.[3]

References Edit

  1. SOA4All, Glossary (full-text).
  2. Framework for Cyber-Physical Systems, at 14.
  3. NIST Framework and Roadmap for Smart Grid Interoperability Standards, Release 2.0, at 22.

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