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ISO 9126

ISO/IEC 9126 Software engineering — Product quality is an international standard for the evaluation  of software quality.

Functionality – A set of attributes that bear on the existence of a set of functions and their specified properties. The functions are those that satisfy stated or implied needs.

  • Suitability
  • Accuracy
  • Interoperability
  • Compliance
  • Security

Reliability – A set of attributes that bear on the capability of software to maintain its level of performance under stated conditions for a stated period of time.

  • Maturity
  • Recoverability
  • Fault Tolerance

Usability – A set of attributes that bear on the effort needed for use, and on the individual assessment of such use, by a stated or implied set of users.

  • Learnability
  • Understandability
  • Operability

Efficiency – A set of attributes that bear on the relationship between the level of performance of the software and the amount of resources used, under stated conditions.

  • Time Behaviour
  • Resource Behaviour

Maintainability – A set of attributes that bear on the effort needed to make specified modifications.

  • Stability
  • Analyzability
  • Changeability
  • Testability

Portability – A set of attributes that bear on the ability of software to be transferred from one environment to another.

  • Installability
  • Replaceability
  • Adaptability
  • Conformance (similar to compliance, above, but here related specifically to portability, e.g. conformance to a particular database standard)

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