ISO IEC 25000-2014 pdf download – Systems and software engineering一Systems and software Quality Requirements and Evaluation (SQuaRE) – Guide to SQuaRE.
Note 1 to entry: The system or software quality characteristic or subcharacteristic of the entity is derived afterwards by calculating a software quality measure. 4.27 quality model defined set of characteristics, and of relationships between them, which provides a framework for specifying quality requirements and evaluating quality 4.28 rating action of mapping the measured value to the appropriate rating level. Used to determine the rating level associated with the system or software product for a specific quality characteristic 4.29 rating level scale point on an ordinal scale, which is used to categorise a measurement scale Note 1 to entry: The rating level enables software product to be classified (rated) in accordance with the stated or implied needs. Note 2 to entry: Appropriate rating levels may be associated with the different views of quality i.e. Users’, Managers’ or Developers’. 4.30 scale ordered set of values, continuous or discrete, or a set of categories to which the attribute is mapped [SOURCE: ISO/IEC 15939:2007]
The Divisions within SQuaRE model are: . ISO/IEC 2500n – Quality Management Division. The International Standards that form this division define all common models, terms and definitions referred to by all other standards from the SQuaRE series. Referring paths (guidance through SQuaRE documents) and high level practical suggestions in applying proper standards to specific application cases offer help to all types of users. The division also provides requirements and guidance for a supporting function, which is responsible for the management of product requirements specification and evaluation. ISO/IEC 2501n . Quality Model Division. The International Standards that form this division present detailed quality models for systems and software product, quality in use and data. Practical guidance on the use of the quality model is also provided. – ISO/IEC 2502n – Quality Measurement Division. The International Standards that form this division include a system and software product quality measurement reference model, mathematical definitions of quality measures, and practical guidance for their application. This division presents internal measures of software quality, external measures of system or software product quality and quality in use measures. Quality measure elements forming foundations for the latter measures are defined and presented. – ISO/IEC 2503n – Quality Requirements Division. The International Standard that forms this division helps specifying quality requirements. These quality requirements can be used in the process of quality requirements elicitation for a product to be developed or as inputs for an evaluation process. The requirements definition process is mapped to technical processes defined in ISO/IEC 15288:2008.