GSO ISO/IEC 9126-1:2009
Gulf Standard
Current Edition
·
Approved on
17 October 2009
·
Software engineering - Product quality – Part 1: Quality model
GSO ISO/IEC 9126-1:2009 Files
English
25 Pages
Current Edition
Reference Language
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GSO ISO/IEC 9126-1:2009 Scope
This part of ISO/IEC 9126 describes a two-part model for software product quality: a) internal quality
and external quality, and b) quality in use. The first part of the model specifies six characteristics for
internal and external quality, which are further subdivided into subcharacteristics. These
subcharacteristics are manifested externally when the software is used as a part of a computer
system, and are a result of internal software attributes. This part of ISO/IEC 9126 does not elaborate
the model for internal and external quality below the level of subcharacteristics.
The second part of the model specifies four quality in use characteristics, but does not elaborate the
model for quality in use below the level of characteristics. Quality in use is the combined effect for the
user of the six software product quality characteristics.
The characteristics defined are applicable to every kind of software, including computer programs and
data contained in firmware. The characteristics and subcharacteristics provide consistent terminology
for software product quality. They also provide a framework for specifying quality requirements for
software, and making trade-offs between software product capabilities.
Normative Annex A provides recommendations and requirements for software product metrics and
quality in use metrics. Examples of these metrics are contained in other parts of ISO/IEC 9126. These
metrics are applicable when specifying the quality requirements and the design goals for software
products, including intermediate products. An explanation of how this quality model can be applied in
software product evaluation is contained in ISO/IEC 14598-1.
This part of ISO/IEC 9126 enables software product quality to be specified and evaluated from
different perspectives by those associated with acquisition, requirements, development, use,
evaluation, support, maintenance, quality assurance and audit of software. It can for example be used
by developers, acquirers, quality assurance staff and independent evaluators, particularly those
responsible for specifying and evaluating software product quality. Examples of uses of the quality
model defined in this part of ISO/IEC 9126 are to:
• validate the completeness of a requirements definition;
• identify software requirements;
• identify software design objectives;
• identify software testing objectives;
• identify quality assurance criteria;
• identify acceptance criteria for a completed software product.
NOTE 1 This part of ISO/IEC 9126 can be used in conjunction with ISO/IEC 15504 (which is concerned with the
software process assessment) to provide:
• a framework for software product quality definition in the customer-supplier process;
• support for review, verification and validation, and a framework for quantitative quality evaluation, in the
support process;
• support for setting organisational quality goals in the management process.
NOTE 2 This part of ISO/IEC 9126 can be used in conjunction with ISO/IEC 12207 (which is concerned with the
software lifecycle) to provide:
• a framework for software product quality requirements definition in the primary lifecycle process;
• support for review, verification and validation in supporting lifecycle processes.
NOTE 3 This part of ISO/IEC 9126 can be used in conjunction with ISO 9001 (which is concerned with quality
assurance processes) to provide:
• support for setting quality goals;
• support for design review, verification and validation.
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