Product quality is an international standard for the evaluation of software quality. The fundamental objective of this standard is to address some of the well known human biases that can adversely affect the delivery and perception of a software development project. By clarifying, then agreeing on the project priorities and subsequently converting abstract priorities to measurable values, ISO/IEC 9126 tries to develop a common understanding of the project’s objectives and goals.

The quality model presented in the first part of the standard, ISO/IEC 9126-1, classifies software quality in a structured set of characteristics and sub-characteristics.

iso9126-1

  • 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.
  • 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.
  • 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.
  • 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.
  • Maintainability – A set of attributes that bear on the effort needed to make specified modifications.
  • Portability – A set of attributes that bear on the ability of software to be transferred from one environment to another.
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