Systems and software engineering - Systems and software product Quality Requirements and Evaluation (SQuaRE) - Common Industry Format (CIF) for usability: Context of use description (ISO/IEC 25063:2014)

ISO/IEC 25063:2014 describes the Common Industry Format (CIF) for context of use descriptions and specifies the contents of both high-level and detailed descriptions of the context of use for an existing, intended, implemented or deployed system. A context-of-use description includes information about the users and other stakeholder groups, the characteristics of each user group, the goals of the users, the tasks of the users, and the environment(s) in which the system is used.
The context of use description is applicable to software and hardware systems, products or services (excluding generic products, such as a display screen or keyboard). It is important to gather and analyse information on the current context in order to understand and then describe the context that will apply in the future system. The context of use description provides a collection of data relevant for analysis, specification, design and evaluation of an interactive system from the perspective of the various user groups and other stakeholders.

System- und Software-Engineering - Qualitätskriterien und Bewertung von Systemen und Softwareprodukten (SQuaRE) - Allgemeines Industrieformat (CIF) zur Gebrauchstauglichkeit: Nutzungskontextbeschreibung (ISO/IEC 25063:2014)

Ingénierie des systèmes et du logiciel - Exigences de qualité et évaluation des systèmes et du logiciel (SQuaRE) - Format industriel commun (CIF) pour l'utilisabilité: Description du contexte d'utilisation (ISO/IEC 25063:2014)

L'ISO/IEC 25063:2014 spécifie les contenus des descriptions - à la fois générales et détaillées - du contexte d'utilisation d'un système, produit ou service existant, conçu ou mis en ?uvre.
La description du contexte d'utilisation s'applique aux systèmes, produits ou services des logiciels et matériels (à l'exception des produits génériques, tels qu'un écran d'affichage ou clavier). La description du contexte d'utilisation est destinée à être utilisée dans le cadre de documents relatifs au niveau système, dérivés des processus de développement tels que ceux figurant dans l'ISO 9241‑210 et dans les normes de procédés/processus de l'ISO/IEC JTC 1/SC 7.
L'ISO/IEC 25063:2014 n'impose aucun type de méthode, cycle de vie, ni procédé/processus.
L'élément d'information d'un contexte d'utilisation peut être intégré dans tous les types de modèles de processus.
NOTE Afin d'établir des modèles de processus, l'ISO/IEC/TR 24774[16] et l'ISO/IEC 15504‑2[9] spécifient respectivement les exigences de format et de conformité applicables aux modèles de procédés/processus. En outre, l'ISO/IEC 15289[8] définit les types et le contenu des éléments d'information élaborés et utilisés dans les modèles de processus dans le cadre de la gestion du cycle de vie du système et du logiciel. L'ISO/IEC 15504‑5[10] et l'ISO/IEC 15504‑6[11] définissent les produits fabriqués, y compris les éléments d'information, à des fins d'évaluation de la capacité des procédés (ou processus). Les modèles de processus et les éléments d'information associés à la conception centrée sur l'opérateur humain des systèmes interactifs sont contenus respectivement dans l'ISO/TR 18529[13] et dans l'ISO/TS 18152[12].
L'ISO/IEC 25063:2014 décrit également la finalité de l'utilisation des descriptions du contexte d'utilisation et identifie les utilisateurs cibles des descriptions du contexte d'utilisation.
Si l'ISO/IEC 25063:2014 spécifie les éléments de contenu nécessaires à un descriptif de contexte d'utilisation, elle n'impose cependant aucune structure ni présentation particulières concernant la documentation du contexte d'utilisation.

Sistemi in programska oprema - Zahteve za kakovost in vrednotenje sistemov in programske opreme (SQuaRE) - Skupni industrijski format (CIF) za uporabnost: kontekst opisa uporabe (ISO/IEC 25063:2014)

Standard ISO/IEC 25063:2014 opisuje skupni industrijski format (CIF) za opise kontekstov uporabe ter določa visokonivojske in podrobne opise konteksta uporabe za obstoječi, predvideni ali uvedeni sistem oziroma sistem v uporabi. Opis konteksta uporabe vključuje informacije o uporabnikih in drugih skupinah interesnih strani, lastnostih posamezne skupine uporabnikov, ciljih uporabnikov, nalogah uporabnikov in okoljih, v katerih se sistem uporablja.
Opis konteksta uporabe se uporablja za sisteme programske in strojne opreme, izdelke ali storitve, vendar ne za izdelke za splošno uporabo, kot so zasloni ali tipkovnice. Za razumevanje in opis konteksta, ki se bo uporabljal v prihodnjem sistemu, je treba zbirati in analizirati informacije o trenutnem kontekstu. Opis konteksta uporabe podaja zbirko podatkov za analizo, specifikacijo, načrt in vrednotenje interaktivnega sistema z vidika različnih skupin uporabnikov in drugih interesnih strani.

General Information

Status
Published
Public Enquiry End Date
02-Mar-2017
Publication Date
08-Nov-2017
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Jun-2017
Due Date
18-Aug-2017
Completion Date
09-Nov-2017

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SLOVENSKI STANDARD
SIST EN ISO/IEC 25063:2017
01-december-2017
Sistemi in programska oprema - Zahteve za kakovost in vrednotenje sistemov in
programske opreme (SQuaRE) - Skupni industrijski format (CIF) za uporabnost:
kontekst opisa uporabe (ISO/IEC 25063:2014)
Systems and software engineering - Systems and software product Quality

Requirements and Evaluation (SQuaRE) - Common Industry Format (CIF) for usability:

Context of use description (ISO/IEC 25063:2014)
System- und Software-Engineering - Qualitätskriterien und Bewertung von Systemen
und Softwareprodukten (SQuaRE) - Allgemeines Industrieformat (CIF) zur
Gebrauchstauglichkeit: Nutzungskontextbeschreibung (ISO/IEC 25063:2014)

Ingénierie des systèmes et du logiciel - Exigences de qualité et évaluation des systèmes

et du logiciel (SQuaRE) - Format industriel commun (CIF) pour l'utilisabilité: Description

du contexte d'utilisation (ISO/IEC 25063:2014)
Ta slovenski standard je istoveten z: EN ISO/IEC 25063:2017
ICS:
35.080 Programska oprema Software
SIST EN ISO/IEC 25063:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO/IEC 25063:2017
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SIST EN ISO/IEC 25063:2017
EN ISO/IEC 25063
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 35.080
English Version
Systems and software engineering - Systems and software
product Quality Requirements and Evaluation (SQuaRE) -
Common Industry Format (CIF) for usability: Context of
use description (ISO/IEC 25063:2014)

Ingénierie des systèmes et du logiciel - Exigences de System- und Software-Engineering - Qualitätskriterien

qualité et évaluation des systèmes et du logiciel und Bewertung von Systemen und Softwareprodukten

(SQuaRE) - Format industriel commun (CIF) pour (SQuaRE) - Allgemeines Industrieformat (CIF) zur

l'utilisabilité: Description du contexte d'utilisation Gebrauchstauglichkeit: Nutzungskontextbeschreibung

(ISO/IEC 25063:2014) (ISO/IEC 25063:2014)
This European Standard was approved by CEN on 6 April 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/IEC 25063:2017 E

worldwide for CEN national Members.
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SIST EN ISO/IEC 25063:2017
EN ISO/IEC 25063:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO/IEC 25063:2017
EN ISO/IEC 25063:2017 (E)
European foreword

The text of ISO/IEC 25063:2014 has been prepared by Technical Committee ISO/IEC JTC 1 “Information

technology” of the International Organization for Standardization (ISO) and the International

Electrotechnical Commission (IEC) and has been taken over as EN ISO/IEC 25063:2017 by Technical

Committee CEN/TC 122 “Ergonomics” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical This European Standard shall be given the status of a national standard, either by publication

of an identical text or by endorsement, at the latest by November 2017, and conflicting national

standards shall be withdrawn at the latest by November 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO/IEC 25063:2014 has been approved by CEN as EN ISO/IEC 25063:2017 without any

modification.
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SIST EN ISO/IEC 25063:2017
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SIST EN ISO/IEC 25063:2017
INTERNATIONAL ISO/IEC
STANDARD 25063
First edition
2014-03-15
Systems and software engineering —
Systems and software product
Quality Requirements and Evaluation
(SQuaRE) — Common Industry Format
(CIF) for usability: Context of use
description
Ingénierie des systèmes et du logiciel — Exigences de qualité et
évaluation des systèmes et du logiciel (SQuaRE) — Format industriel
commun (CIF) pour l’utilisabilité: Description du contexte d’utilisation
Reference number
ISO/IEC 25063:2014(E)
ISO/IEC 2014
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO/IEC 2014 – All rights reserved
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Conformance ............................................................................................................................................................................................................. 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Purposes and types of context of use descriptions ........................................................................................................... 4

4.1 General ........................................................................................................................................................................................................... 4

4.2 Initial outline of the context of use ........................................................................................................................................ 6

4.3 Detailed context of use descriptions .................................................................................................................................... 6

4.4 Context of use for an evaluation ............................................................................................................................................... 7

4.5 Context of use information included in a product description...................................................................... 7

5 Elements of a context of use description ..................................................................................................................................... 8

5.1 General ........................................................................................................................................................................................................... 8

5.2 Subject of the context of use description ......................................................................................................................... 9

5.3 User population ...................................................................................................................................................................................10

5.4 Goals and responsibilities of the user group and the organization ........................................................13

5.5 Tasks of the users ...............................................................................................................................................................................14

5.6 Environment(s) of the user .......................................................................................................................................................16

5.7 Problems ...................................................................................................................................................................................................18

Annex A (informative) Initial outline of the context of use ........................................................................................................20

Annex B (informative) Users of the context of use ..............................................................................................................................21

Annex C (informative) Example of a context of use checklist ..................................................................................................23

Bibliography .............................................................................................................................................................................................................................32

© ISO/IEC 2014 – All rights reserved iii
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical

activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the

work. In the field of information technology, ISO and IEC have established a joint technical committee,

ISO/IEC JTC 1.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of the joint technical committee is to prepare International Standards. Draft International

Standards adopted by the joint technical committee are circulated to national bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the national bodies

casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO/IEC 25063 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,

Subcommittee SC 7, Software and systems engineering, in collaboration with Technical Committee

ISO/TC 159, Ergonomics, Subcommittee SC 4, Ergonomics of human-system interaction.

iv © ISO/IEC 2014 – All rights reserved
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)
Introduction
[4]

The human-centred design approach of ISO 9241-210 is well established and focuses specifically

on making systems usable. Usability can be achieved by applying human-centred design and testing

throughout the life cycle. In order to enable a human-centred approach to be adopted, it is important

that all the relevant types of information related to usability (information items) are identified and

communicated. This identification and communication enables the usability of a system to be designed

and tested.

This International Standard provides a framework and consistent terminology for describing the context

of use of an interactive system. It is intended to assist developers in documenting and communicating

usability-related information through the system development life cycle.

The Common Industry Format (CIF) for Usability family of International Standards is described in

[19] [17]

ISO/IEC TR 25060 and is part of the SQuaRE series (ISO/IEC 25000 to ISO/IEC 25099) of standards

on systems and software product quality requirements and evaluation.

The CIF family of standards uses definitions that are consistent with the ISO 9241 series of standards

(Ergonomics of human system interaction), as this is the terminology that is normally used for this

subject matter.
CIF standards are planned for the following information items:
— Context of use description (ISO/IEC 25063);
— User needs report (ISO/IEC 25064);
— User requirements specification (planned ISO/IEC 25065);
— User interaction specification;
— User interface specification;
— Evaluation report (planned ISO/IEC 25066);
— Field data report.

The CIF standards are part of the “Extension Division” of the ISO/IEC 25000 “SQuaRE” series of

International Standards (see Figure 1).
Figure 1 — Organization of SQuaRE series of International Standards
[2] [18]

Context of use is defined in ISO 9241-11. The system quality model in ISO/IEC 25010 incorporates

context of use.
© ISO/IEC 2014 – All rights reserved v
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)
[4]

Figure 2 — Relationship of CIF documents to user centred design in ISO 9241-210 and system

[7]
life cycle processes in ISO/IEC 15288

Figure 2 illustrates the interdependence of these information items with the human-centred design

[4]

activities described in ISO 9241-210 as well as the corresponding System Life Cycle processes

[7]

described in ISO/IEC 15288. The figure depicts the activities as a set of intersecting areas. The circles

overlap to represent that the activities are not separate, but rather, overlapping in time and scope and

the outcome of each activity provides the input to one or more other activities. As each human-centred

design activity can provide input to any other, there is no starting point, no end point, or linear process

intended.

Human-centred design relies on user needs that are first identified based on the Context of Use analysis.

User needs are documented in the User Needs Report (ISO/IEC 25064), which is an intermediate

deliverable that links the Context of Use Description (ISO/IEC 25063) that contains Information about

the users, their tasks and the organizational and physical environment, to the user requirements.

These items are developed during the Stakeholders Requirements Definition Process described in

[7]
ISO/IEC 15288.

The “Produce design solutions” activity focuses on designing user interaction that meets user

requirements. This activity takes place during the Architectural Design, Implementation, and Integration

[7]

processes described in ISO/IEC 15288 and produces the information items “User Interaction

Specification” and the “User Interface Specification”.

The “Evaluate” activity starts at the earliest stages in the project, evaluating design concepts to obtain

a better understanding of the user needs. Design solutions can be evaluated multiple times as the

interactive system is being developed, and can produce various types of evaluation report, and usability

[20] [7]

data such as that described in ISO/IEC 25062 can support the ISO/IEC 15288 validation process

that confirms that the system complies with the stakeholder requirements.
vi © ISO/IEC 2014 – All rights reserved
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SIST EN ISO/IEC 25063:2017
INTERNATIONAL STANDARD ISO/IEC 25063:2014(E)
Systems and software engineering — Systems and software
product Quality Requirements and Evaluation (SQuaRE) —
Common Industry Format (CIF) for usability: Context of use
description
1 Scope

This International Standard specifies the contents of both high-level and detailed descriptions of context

of use for an existing, intended, designed or implemented system, product or service.

The context of use description is applicable to software and hardware systems, products or services

(excluding generic products, such as a display screen or keyboard). The description of the context of

use is intended to be used as part of system-level documentation resulting from development processes

such as those in ISO 9241-210 and ISO/IEC JTC 1/SC 7 process standards.

This International Standard does not prescribe any kind of method, life cycle or process.

The context of use information item can be integrated into any type of process model.

[16] [9]

NOTE For the purpose of establishing process models, ISO/IEC TR 24774 and ISO/IEC 15504-2 specify

[8]

the format and conformance requirements for process models, respectively. In addition, ISO/IEC 15289 defines

the types and content of information items developed and used in process models for system and software life cycle

[10] [11]

management. ISO/IEC 15504-5 and ISO/IEC 15504-6 define work products, including information items,

for the purpose of process capability assessment. Process models and associated information items for human-

[13] [12]

centred design of interactive systems are contained in ISO/TR 18529 and ISO/TS 18152 , respectively.

This International Standard also describes the purposes for which context of use descriptions are used,

and identifies the intended users of context of use descriptions.

While this International Standard specifies the required content elements of a context of use description,

it does not prescribe any particular structure or layout for documenting the context of use.

2 Conformance

A description of the context of use conforms to this International Standard if it contains all the required

elements specified in Clause 5.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
accessibility

extent to which products, systems, services, environments and facilities can be used by people from

a population with the widest range of characteristics and capabilities to achieve a specified goal in a

specified context of use

Note 1 to entry: Context of use includes direct use or use supported by assistive technologies.

[SOURCE: ISO 26800:2011, 2.1]
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SIST EN ISO/IEC 25063:2017
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3.2
context of use

users, tasks, equipment (hardware, software and materials), and the physical and social environments

in which a system, product or service is used

[SOURCE: ISO 9241-11:1998, 3.5, modified — In the definition, “product” has been replaced by “system,

product or service”.]

Note 1 to entry: In this International Standard, equipment is described as part of the technical and technological

environment.
3.3
effectiveness
accuracy and completeness with which users achieve specified goals
[SOURCE: ISO 9241-11:1998, 3.2]
3.4
efficiency

resources expended in relation to the accuracy and completeness with which users achieve goals

[SOURCE: ISO 9241-11:1998, 3.3]
3.5
goal
intended outcome
[SOURCE: ISO 9241-11:1998, 3.8]
3.6
human-centred design

approach to system design and development that aims to make interactive systems more usable by

focusing on the use of the system; applying human factors, ergonomics and usability knowledge and

techniques

Note 1 to entry: The term “human-centred design” is used rather than “user-centred design” in order to emphasize

that this standard also addresses impacts on a number of stakeholders, not just those typically considered as

users. However, in practice, these terms are often used synonymously.

Note 2 to entry: Usable systems can provide a number of benefits including improved productivity, enhanced user

wellbeing, avoidance of stress, increased accessibility, and reduced risk of harm.

[SOURCE: ISO 9241-210:2010, 2.7]
3.7
information item

separately identifiable body of information that is produced and stored for human use during a system

or software life cycle
[SOURCE: ISO/IEC 15289:2006, 5.11]
3.8
interactive system

combination of hardware, software and/or services that receives input from and communicates output

to users

Note 1 to entry: This includes, where appropriate, packaging, branding, user documentation, online help, support

and training.
[SOURCE: ISO 9241-210:2010, 2.8]
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3.9
persona

representation of a type of user that includes a concise summary of the characteristics of the user that

is most informative to the design or illustrative of specific user requirements

Note 1 to entry: A persona typically includes behaviour patterns, goals, skills, attitudes, and environment, with a

few fictional personal details to make the persona a realistic character.
3.10
requirement

condition or capability that must be met or possessed by a system, system component, product, or

service to satisfy an agreement, standard, specification, or other formally imposed documents

Note 1 to entry: Requirements include the quantified and documented needs, wants, and expectations of the

sponsor, customer, and other stakeholders.
[SOURCE: ISO/IEC/IEEE 24765:2010, 3.2506]
3.11
satisfaction
freedom from discomfort, and positive attitudes towards the use of the product
[SOURCE: ISO 9241-11:1998, 3.4]
3.12
stakeholder

individual or organization having a right, share, claim, or interest in a system or in its possession of

characteristics that meet their needs and expectations
[SOURCE: ISO/IEC 15288:2008, 4.29]
3.13
system

combination of interacting elements organized to achieve one or more stated purposes

Note 1 to entry: A system may be considered as a product or as the services it provides.

Note 2 to entry: In practice, the interpretation of its meaning is frequently clarified by the use of an associative

noun, e.g. aircraft system. Alternatively the word system may be substituted simply by a context-dependent

synonym, e.g. aircraft, though this may then obscure a system principles perspective.

[SOURCE: ISO/IEC 15288:2008, 4.31]
3.14
task
activities required to achieve a goal
[SOURCE: ISO 9241-11:1998, 3.9]
3.15
usability

extent to which a system, product or service can be used by specified users to achieve specified goals

with effectiveness, efficiency and satisfaction in a specified context of use
[SOURCE: ISO 9241-210, 2.13]
3.16
user
person who interacts with a system, product or service

Note 1 to entry: A person who uses the output or service provided by a system. For example, a bank customer who

visits a branch, receives a paper statement, or carries out telephone banking using a call centre can be considered

a user.
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ISO/IEC 25063:2014(E)
[SOURCE: ISO 26800:2011, 2.10]
3.17
user experience

person’s perceptions and responses that result from the use and/or anticipated use of a product, system

or service

Note 1 to entry: User experience includes all the users’ emotions, beliefs, preferences, perceptions, physical and

psychological responses, behaviours and accomplishments that occur before, during and after use.

Note 2 to entry: User experience is a consequence of brand image, presentation, functionality, system performance,

interactive behaviour, and assistive capabilities of the interactive system; the user’s internal and physical state

resulting from prior experiences, attitudes, skills and personality; and the context of use.

Note 3 to entry: Usability, when interpreted from the perspective of the users’ personal goals, can include the

kind of perceptual and emotional aspects typically associated with user experience. Usability criteria can be

established so as to assess aspects of user experience.
[SOURCE: ISO 9241-210:2010, 2.15]
3.18
user interface

all components of an interactive system (software or hardware) that provide information and controls

for the user to accomplish specific tasks with the interactive system
[SOURCE: ISO 9241-110:2006, 3.9]
3.19
user need

prerequisite identified as necessary for a user, or a set of users, to achieve an intended outcome, implied

or stated within a specific context of use
[SOURCE: ISO/IEC 25064:2013, 4.19]
3.20
user requirements
usage requirements

requirements for use that provide the basis for design and evaluation of interactive systems to meet

identified user needs

Note 1 to entry: User requirements are derived from user needs and capabilities in order to make use of the

system in an effective, efficient, safe and satisfying manner.

Note 2 to entry: User requirements specify the extent to which user needs and capabilities are to be met when

using the system. They are not requirements on the users.

Note 3 to entry: In software-engineering terms, user requirements comprise both “functional” and “non-

functional” requirements based on user needs and capabilities.
[SOURCE: ISO/IEC TR 25060:2010, 2.21]
4 Purposes and types of context of use descriptions
4.1 General

The description of the context of use provides common information that is needed for use in conjunction

with the other information items that are to be produced relating to human centred design. Information

about the context of use provides a basis for designing a product that is usable in the intended context of

use, and helps maintain a human-centred design focus within the project.
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SIST EN ISO/IEC 25063:2017
ISO/IEC 25063:2014(E)

Context of use information can be captured in a variety of forms, and descriptions of the context of use

can be formatted to meet the needs of particular audiences.
EXAMPLE 1 Sources of context of use information include:
— Documentation of conducted interviews with users.
— Documentation of observations of users in their real environment.

— Diaries completed by users over a period of time describing their real context of use.

— Documentation of conducted observations of users.
— Documentation of user performance measurements.
— Video files of individual users showing them in their real environment.

EXAMPLE 2 Examples of different representations that can be used to describe the context of use (or parts of

the context of use) include:

— Complete descriptions of users, tasks, equipment (hardware, software and materials), and the physical and

social environments that constitute a detailed context of use description using a structured format (such as

Annex C).

— Narrative descriptions of the context of use (referred to as “scenarios of use”, “context scenarios”, “as is”

scenarios or “problem scenarios”) for each user group, typically based on user interviews.

— Descriptions of users in terms of personas, which represent a type of user by providing a concise summary

of characteristics of an instance of a user, and can include issues such as goals, tasks, skills, attitudes, and

environmental conditions.

The most common types of context of use descriptions are listed below, described in more detail in

the sub-clauses indicated. Depending on the particular design and development situation it could be

necessary to describe some or all of these.
4.2 Initial outline of the context of use
4.3 Detailed context of use descriptions
4.3.1 Current context of use
4.3.2 Intended context of use
4.3.3 Context of use specified as
...

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