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Within systems engineering, quality attributes are non-functional requirements used to evaluate the performance of a system. These are sometimes named "ilities" after the suffix many of the words share. Notable quality attributes include:


Many of these quality attributes can also be applied to data quality.

Common subsets

  • A subset of them (Reliability, Availability, Serviceability, Usability, and Installability) are together referred to as RASUI.
  • Another subset used for Software Requirements (Functionality, Usability, Reliability, Performance, Supportability) are together referred to as FURPS.
  • For databases RASR is an important concept (Reliability, Availability, Scalability, and Recoverability).
  • When dealing with safety-critical systems, the acronym RAMS (Reliability, Availability, Maintainability and Safety) is frequently used.
  • For interoperable software a common subset is (Portability, Operability, Openness and Predictability), sometimes referred to as POOP.

See also

Further reading

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