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ISO/IECFDIS9126-1:2000(E)©

ISO/IEC2000

FINAL DRAFT

ISO/IECJTC1

Secretariat:ANSI

Votingbeginson:

2000-01-20

Votingterminateson:

2000-03-20INTERNATIONALSTANDARDISO/IEC

FDIS

9126-1

Informationtechnology-Software

productquality-

Part1:

QualitymodelTechnologies de l"information - Qualité des produits logiciels -

Partie 1: Modèle de qualité

ISO/IEC FDIS 9126-1:2000(E)

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ii© ISO/IEC 2000 - All rights reserved

ISO/IEC FDIS 9126-1:2000(E)

© ISO/IEC 2000 - All rights reservedii-1In accordance with the provisions of Council Resolution 21/1986, this document iscirculated in the English

language only.

©ISO/IEC

ISO/IEC FDIS 9126-1:2000(E)

iii

Contents

1S cope........................................................................................................................

...........................1

2C onformance.......................................................................................................................................2

3N ormativereference...........................................................................................................................2

4T ermsanddefinitions.........................................................................................................................2

5Q ualitymodelframew ork...................................................................................................................3

5.1A pproachestoquality.....................................................................................................................3

5.2P roductqualityandthelifecycle .....................................................................................................3

5.3It emstobeevaluated.......................................................................................................... ...........6

5.4U singaqualitymodel .....................................................................................................................6

6Q ualitymodelforex ternalandinternal quality...............................................................................7

6.1F unctionality...................................................................................................................................7

6.2R eliability........................................................................................................................................8

6.3U sability..........................................................................................................................................9

6.4E fficiency......................................................................................................................................10

6.5M aintainability...............................................................................................................................10

6.6P ortability......................................................................................................................................11

7Q ualitymodelforqualit yinuse......................................................................................................12

7.1Q ualityinuse................................................................................................................................12

AnnexA (norma tive)Metrics..............................................................................................................14

A.1S oftwaremetrics.........................................................................................................................14

A.2Q ualityinusemetrics..................................................................................................................15

A.3C hoiceofmetricsandmeas ureme ntcriteria...............................................................................16

A.4Metr icsusedforcomparis on........................................................................................................16

AnnexB (inform ative)Definitionsfromotherstandards ................................................................18

AnnexC (inform ative)Historyofthework........................................................................................23

ISO/IEC FDIS 9126-1:2000(E)

© ISO/IEC

iv

Foreword

ISO( theInternation alOrganizationforStandardization)and IEC(theInternationalElectrotechnical Commission)formthespecializ edsystemforwor ldwidestandar dization.Nationalbodiesthatare membersofISOorI ECpar ticipatein the developmentofInt ernationalStandardsthroughtechnic al committeesestablishedbythe respectiveorganizationtodealwi thparticu larfieldsof technicalactivity. ISOan dIECtec hnicalcommitteesco llaborateinfieldsofmutualin terest.Otherinternational organizations,governmentalandnon-gover nmental,inliaisonwithISOand IEC,also takepartinthe work. InternationalStandardsaredraftedi naccordancewiththeru lesgiven intheISO/IECDir ectives,

Part3.

Inth efieldof informationtechnology,I SOan dIEChaveestablishedajoi nttechnicalcommittee, ISO/IECJTC1.DraftInt ernationalStandards adoptedbyth ejointtech nicalcommitteearecirculated tona tionalbodiesforvoting.Publ icationasanInternatio nalStan dardrequiresap provalbyatleast

75% ofthe national bodiescast ingavote.

Attentionisdrawnto thepossib ilitythat someof theelementsof thispartofISO/IEC9126maybethe subjectofpatentrights. ISOand IECshallnotbehe ldresponsiblef oridentifyingany orallsuchpaten t rights. InternationalStandardISO/IEC9126- 1waspreparedbyJointT echnicalCommitteeISO/I ECJTC1, Informationtechnology,SubcommitteeSC7,Softwareengineering . Thisfirst editionofISO/I EC9126-1,togetherwitht heot herpartsofISO/IEC9126,c ancelsand replacesISO/IEC91 26:1991,whichhasbeentechnicallyr evised. ISO/IEC9126consist softhefollo wingparts,underthegeneraltitle

Informationtechnology - Software

productquality - P art1:Qualitym odel - P art2:Externalmetri cs - P art3:Internalmetr ics - Par t4:Qualit yinusemetr ics AnnexAfor msa normativepartofthispar tofI SO/IEC9126-1.AnnexesBan dCarefor informat ion only.

©ISO/IEC

ISO/IEC FDIS 9126-1:2000(E)

v

Introduction

Computers are being used in an increasingly wide variety of application areas, and their correct operation is often critical for business success and/or human safety. Developing or selecting high quality software products is therefore of prime importance. Comprehensive specification and evaluation of software product quality is a key factor in ensuring adequate quality. This can be

achieved by defining appropriate quality characteristics, taking account of the purpose of usage of the

software product. It is important that every relevant software product quality characteristic is specified

and evaluated, whenever possible using validated or widely accepted metrics. ISO/IEC 9126 (1991): Software product evaluation - Quality characteristics and guidelines for their use, which was developed to support these needs, defined six quality characteristics and described a software product evaluation process model. As quality characteristics and associated metrics can be useful not only for evaluating a software product but also for defining quality requirements and other usage, ISO/IEC 9126 (1991) has been replaced by two related multipart standards: ISO/IEC 9126 (Software product quality) and ISO/IEC

14598 (Software product evaluation). The software product quality characteristics defined in this part

of ISO/IEC 9126 can be used to specify both functional and non-functional customer and user requirements.

This part of ISO/IEC 9126 is a revision of ISO/IEC 9126 (1991), and retains the same software quality

characteristics. The major differences are: • the introduction of normative subcharacteristics, most of which are based on the informative subcharacteristics in ISO/IEC 9126 (1991);

• the specification of a quality model;

• the introduction of quality in use;

• removal of the evaluation process (which is now specified in the ISO/IEC 14598 standards); • co-ordination of the content with ISO/IEC 14598-1. The relationship between the standards in the ISO/IEC 9126 and ISO/IEC 14598 series (see Annex D) is illustrated in Figure 1.

ISO/IEC FDIS 9126-1:2000(E)

© ISO/IEC

vi

14598-3

14598-4

14598-5

9126-1

14598-1

9126-29126-49126-3

Resources

and environment

Evaluation

process

Effect of the

software product

Software

product

Evaluation

support

14598-2

14598-6

Evaluation

processInternal metricsExternal metricsQuality in use metrics Figure 1 - Relationship between ISO/IEC 9126 and ISO/IEC 14598 standards FINAL DRAFT INTERNATIONAL STANDARD ISO/IEC FDIS 9126-1:2000(E) 1

1Scope

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 1This 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;

Informationtechnology - Soft wareproductquality -

Part1:

Qualitymodel

© ISO/IEC

/Touch-Up_Line ISO/IEC FDIS 9126-1:2000(E)/Touch-Up_Line

© ISO/IEC/Touch-Up_Line/Touch-Up_Line

2 /Touch-Up_Line

•support for review, verification and validation, and a framework for quantitative quality evaluation, in the/Touch-Up_Line

support process; /Touch-Up_Line support for setting organisational quality goals in the management process. /Touch-Up_Line

NOTE 2This part of ISO/IEC 9126 can be used in conjunction with ISO/IEC 12207 (which is concerned with the/Touch-Up_Line

software lifecycle) to provide: /Touch-Up_Line a framework for software product quality requirements definition in the primary lifecycle process; /Touch-Up_Line support for review, verification and validation in supporting lifecycle processes. /Touch-Up_Line

NOTE 3This part of ISO/IEC 9126 can be used in conjunction with ISO 9001 (which is concerned with quality/Touch-Up_Line

assurance processes) to provide: /Touch-Up_Line support for setting quality goals; /Touch-Up_Line support for design review, verification and validation. /Touch-Up_Line

2Conformance/Touch-Up_Line

Any software product quality requirement, specification or evaluation that conforms to this part of /Touch-Up_Line

ISO/IEC 9126 shall either use the characteristics and subcharacteristics from clauses 6 and 7, giving

/Touch-Up_Line

the reasons for any exclusions, or describe its own categorisation of software product quality attributes

/Touch-Up_Line and provide a mapping to the characteristics and subcharacteristics in clauses 6 and 7. /Touch-Up_Line

A software product quality requirement or specification that contains metrics used for comparison shall

/Touch-Up_Line state whether the metrics have the properties specified in A.4. /Touch-Up_Line

3Normative reference/Touch-Up_Line

The following normative document contains provisions which, through reference in this text, constitute

/Touch-Up_Line provisions of this part of ISO/IEC 9126. For dated references, subsequent amendments to, or /Touch-Up_Line

revisions of, any of these publications do not apply. However, parties to agreements based on this part

/Touch-Up_Line

of ISO/IEC 9126 are encouraged to investigate the possibility of applying the most recent edition of

/Touch-Up_Line the normative document indicated below. For undated references, the latest edition of the normative /Touch-Up_Line document referred to applies. Members of ISO and IEC maintain registers of currently valid /Touch-Up_Line

International Standards.

/Touch-Up_Line

ISO/IEC 14598-1:1999,

Information technology Software product evaluation Part 1: General /Touch-Up_Line overview. /Touch-Up_Line

4Terms and definitions/Touch-Up_Line

For the purposes of all parts of ISO/IEC 9126, the following definition and the definitions contained in

/Touch-Up_Line

ISO/IEC 14598-1 apply.

/Touch-Up_Line

NOTEThe definitions contained in ISO/IEC 14598-1 are reproduced in informative annex B./Touch-Up_Line

4.1 /Touch-Up_Line level of performance /Touch-Up_Line the degree to which the needs are satisfied, represented by a specific set of values for the quality /Touch-Up_Line characteristics /Touch-Up_Line© ISO/IEC/Touch-Up_Line

ISO/IEC FDIS 9126-1:2000(E)

/Touch-Up_Line /Touch-Up_Line 3 /Touch-Up_Line

5Quality model framework/Touch-Up_Line

This clause describes a quality model framework which explains the relationship between different /Touch-Up_Line

approaches to quality. A specific implementation of this quality model is given in clauses 6 and 7.5.1.

/Touch-Up_Line 5.1

Approaches to quality

/Touch-Up_Line

Figure 2 - Quality in the lifecycle

/Touch-Up_Line

User quality needs include requirements for quality in use in specific contexts of use. These identified

/Touch-Up_Line needs can be used when specifying external and internal quality using software product quality /Touch-Up_Line characteristics and subcharacteristics. /Touch-Up_Line

Evaluation of software products in order to satisfy software quality needs is one of the processes in the

/Touch-Up_Line software development lifecycle. Software product quality can be evaluated by measuring internal /Touch-Up_Line attributes (typically static measures of intermediate products), or by measuring external attributes /Touch-Up_Line (typically by measuring the behaviour of the code when executed), or by measuring quality in use /Touch-Up_Line

attributes. The objective is for the product to have the required effect in a particular context of use

/Touch-Up_Line (Figure 2). /Touch-Up_Line

Process quality (the quality of any of the lifecycle processes defined in ISO/IEC 12207) contributes to

/Touch-Up_Line improving product quality, and product quality contributes to improving quality in use. Therefore, /Touch-Up_Line assessing and improving a process is a means to improve product quality, and evaluating and /Touch-Up_Line

improving product quality is one means of improving quality in use. Similarly, evaluating quality in use

/Touch-Up_Line can provide feedback to improve a product, and evaluating a product can provide feedback to improve /Touch-Up_Line a process. /Touch-Up_Line

Appropriate internal attributes of the software are a pre-requisite for achieving the required external

/Touch-Up_Line

behaviour, and appropriate external behaviour is a pre-requisite for achieving quality in use (Figure 2).

/Touch-Up_Line

The requirements for software product quality will generally include assessment criteria for internal

/Touch-Up_Line

quality, external quality and quality in use, to meet the needs of developers, maintainers, acquirers

/Touch-Up_Line and end users. (See ISO/IEC 14598-1:1999, clause 8.) /Touch-Up_Line

5.2Product quality and the lifecycle/Touch-Up_Line

The views of internal quality, external quality and quality in use change during the software lifecycle.

/Touch-Up_Line

For example, quality specified as quality requirements at the start of the lifecycle is mostly seen from

/Touch-Up_Line

the external and users" view, and it differs from the interim product quality, such as design quality,

/Touch-Up_Line which is mostly seen from the internal and developers view. The technologies used for achieving the /Touch-Up_Line necessary level of quality, such as specification and evaluation of quality, need to support these /Touch-Up_Line

diverse points of view. It is necessary to define these perspectives and the associated technologies

/Touch-Up_Line for quality, in order to manage quality properly at each stage of the lifecycle. /Touch-Up_Line process/Touch-Up_Line quality/Touch-Up_Line external/Touch-Up_Line quality in/Touch-Up_Line use/Touch-Up_Line attributes/Touch-Up_Linecontexts/Touch-Up_Lineof use/Touch-Up_Line quality inuse/Touch-Up_Line measures/Touch-Up_Lineinternal /Touch-Up_Line measures/Touch-Up_Lineinternal /Touch-Up_Linequality/Touch-Up_Lineattributes/Touch-Up_Line influencesinfluences/Touch-Up_Line depends on/Touch-Up_Lineinfluences/Touch-Up_Line

depends on/Touch-Up_Linedepends on/Touch-Up_Lineprocesssoftware product/Touch-Up_Lineeffect of software /Touch-Up_Lineproduct

/Touch-Up_Line ISO/IEC FDIS 9126-1:2000(E)/Touch-Up_Line

© ISO/IEC/Touch-Up_Line/Touch-Up_Line

4 /Touch-Up_Line

The goal is to achieve the necessary and sufficient quality to meet the real needs of users. ISO 8402

/Touch-Up_Line

defines quality in terms of the ability to satisfy stated and implied needs. However, needs stated by a

/Touch-Up_Line user do not always reflect the real user needs, because: (1) a user is often not aware of his real /Touch-Up_Line needs, (2) needs may change after they are stated, (3) different users may have different operating /Touch-Up_Line

environments, and (4) it may be impossible to consult all the possible types of user, particularly for off-

/Touch-Up_Line the-shelf software. So quality requirements cannot be completely defined before the beginning of /Touch-Up_Line design. Yet, it is necessary to understand the real user needs in as much detail as possible, and /Touch-Up_Line

represent these in the requirements. The goal is not necessarily to achieve perfect quality, but the

/Touch-Up_Line necessary and sufficient quality for each specified context of use when the product is delivered and /Touch-Up_Line actually used by users. /Touch-Up_Line Measurement scales for the metrics used for quality requirements can be divided into categories /Touch-Up_Linequotesdbs_dbs6.pdfusesText_12

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