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The capability of the software product to provide functions which meet stated and implied needs when the software is used under specified conditions. [ ISO/IEC 9126-1 ]

Other Definitions

Functionality [ IEEE 1362
The capabilities of the various computational, user interface, input, output, data management, and other features provided by a product.


  • Functionality is one of the six characteristics of quality in the ISO/IEC 9126 quality model.
  • This characteristic is concerned with what the software does to fulfil needs, whereas the other characteristics are mainly concerned with when and how it fulfils needs. [ ISO/IEC 9126-1 ]
  • For a system which is operated by a user, the combination of functionality, reliability, usability and efficiency can be measured externally by quality in use. [ ISO/IEC 9126-1 ]

See also


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