1、BS EN ISO9241-20:2009ICS 13.180; 35.180NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDErgonomics of human-system interactionPart 20: Accessibility guidelinesfor information/communicationtechnology (ICT) equipment andservices (ISO 9241-20:2008)This British Stand
2、ard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2009 BSI 2009ISBN 978 0 580 69256 7Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 9241-20:2009National forewordThis British Standard is the UK implementation of EN ISO9241-20:2009
3、. It is identical to ISO 9241-20:2008.The UK participation in its preparation was entrusted to TechnicalCommittee PH/9, Applied ergonomics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary p
4、rovisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 9241-20January 2009ICS 13.180; 35.180English VersionErgonomics of human-system interaction
5、- Part 20: Accessibilityguidelines for information/communication technology (ICT)equipment and services (ISO 9241-20:2008)Ergonomie de linteraction homme-systme - Partie 20:Lignes directrices sur laccessibilit de lquipement et desservices des technologies de linformation et de lacommunication (TIC)
6、(ISO 9241-20:2008)Ergonomie der Mensch-System-Interaktion - Teil 20:Leitlinien fr die Zugnglichkeit der Gerte und Dienste inder Informations- und Kommunikationstechnologie (ISO9241-20:2008)This European Standard was approved by CEN on 29 December 2008.CEN members are bound to comply with the CEN/CEN
7、ELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any
8、CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN m
9、embers are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden,
10、 Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No.
11、EN ISO 9241-20:2009: EBS EN ISO 9241-20:2009EN ISO 9241-20:2009 (E) 3 Foreword The text of ISO 9241-20:2008 has been prepared by Technical Committee ISO/TC 159 “Ergonomics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 9241-20:2009 by Technical Committ
12、ee 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 text or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest
13、by July 2009. 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 standard
14、s organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portu
15、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 9241-20:2008 has been approved by CEN as a EN ISO 9241-20:2009 without any modification. BS EN ISO 9241-20:2009ISO 9241-20:2008(E) ISO 2008 All rights reserved iiiContents Page For
16、eword iv Introduction . vi 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Application 3 4.1 Principles. 3 4.2 Application framework . 4 4.3 Implementing the recommendations 4 4.4 Conformance. 5 5 Accessibility 7 5.1 General. 7 5.2 Context(s) of use and accessibility. 7 5.3 Proce
17、ss 8 6 Recommendations related to managing development. 8 6.1 Information accessibility policy 8 6.2 Development accountability 8 7 Recommendations related to user characteristics . 8 7.1 General. 8 7.2 Vision . 11 7.3 Hearing. 12 7.4 Speech . 14 7.5 Physical capabilities. 14 7.6 Cognitive capabilit
18、ies. 16 8 Recommendations related to task characteristics 17 8.1 Performing tasks based on context of use 17 8.2 Providing alternative ways of performing tasks 18 8.3 Performing maintenance and other non-task related operations 18 9 Recommendations related to equipment and service characteristics 18
19、 9.1 General. 18 9.2 Other standards for ICT equipment and services . 20 9.3 Assistive technologies. 20 9.4 Selection and operation of ICT equipment and services 21 9.5 Preparation and completion of operation 21 10 Recommendations related to environmental characteristics 22 10.1 Operating in a range
20、 of environments 22 10.2 Designing environments 22 10.3 Impacting the environment 23 Annex A (informative) Overview of the ISO 9241 series. 24 Annex B (informative) Sample checklist for assessing applicability and conformance of ICT equipment and services. 28 Annex C (informative) User needs 33 Bibl
21、iography . 42 BS EN ISO 9241-20:2009ISO 9241-20:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out t
22、hrough ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO colla
23、borates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Sta
24、ndards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements o
25、f this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9241-20 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4, Ergonomics of human-system interaction. ISO 9241 consists of the following
26、parts, under the general title Ergonomic requirements for office work with visual display terminals (VDTs): Part 1: General introduction Part 2: Guidance on task requirements Part 3: Visual display requirements Part 4: Keyboard requirements Part 5: Workstation layout and postural requirements Part 6
27、: Guidance on the work environment Part 7: Requirements for display with reflections Part 8: Requirements for displayed colours Part 9: Requirements for non-keyboard input devices Part 11: Guidance on usability Part 12: Presentation of information Part 13: User guidance Part 14: Menu dialogues Part
28、15: Command dialogues Part 16: Direct manipulation dialogues BS EN ISO 9241-20:2009ISO 9241-20:2008(E) ISO 2008 All rights reserved v Part 17: Form filling dialogues Guidance on software individualization is to form the subject of a future part 129. ISO 9241 also consists of the following parts, und
29、er the general title Ergonomics of human-system interaction: Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services Part 110: Dialogue principles Part 151: Guidance on World Wide Web user interfaces Part 171: Guidance on software accessibility Part 30
30、0: Introduction to electronic visual display requirements Part 302: Terminology for electronic visual displays Part 303: Requirements for electronic visual displays Part 304: User performance test methods Part 305: Optical laboratory test methods for electronic visual displays Part 306: Field assess
31、ment methods for electronic visual displays Part 307: Analysis and compliance test methods for electronic visual displays Part 308: Surface-conduction electron-emitter displays (SED) Technical Report Part 400: Principles and requirements for physical input devices Part 410: Design criteria for physi
32、cal input devices Part 920: Guidance on tactile and haptic interactions Framework for tactile and haptic interaction is to form the subject of a future part 910. BS EN ISO 9241-20:2009ISO 9241-20:2008(E) vi ISO 2008 All rights reservedIntroduction The number of people using information/communication
33、 technologies (ICT) equipment and services, which combine hardware, software and network technologies, is increasing, as is the variety of ICT equipment and services. Our everyday lives are filled by such equipment and services. This part of ISO 9241 is intended to help developers enable ICT equipme
34、nt and services (and forthcoming novel or innovative equipment and services) so that they can be used by the widest range of people, regardless of their capabilities or disabilities, limitations or culture. This part of ISO 9241 is based on the current understanding of the characteristics of individ
35、uals who have particular physical, sensory and/or cognitive impairments. However, accessibility is an issue that affects many people. The users of interactive systems are consumers or professionals with roles such as home occupiers, school pupils, engineers, clerks, salespersons and web designers. T
36、he individuals in such target groups vary significantly as regards physical, sensory and cognitive abilities and each target group will include people with different abilities. Thus people with disabilities do not form a specific group that can be separated out and then disregarded. The differences
37、in capabilities may arise from a variety of factors that serve to limit the capability to engage in the activities of daily living, and are a “universal human experience”. Therefore, accessibility addresses a widely defined group of users including people with physical, sensory and cognitive impairm
38、ents present at birth or acquired during life, elderly people (a growing percentage of the population), who can benefit from new products and services but who experience reduced physical, sensory and cognitive capacities, people with temporary disabilities, such as a person with a broken arm or some
39、one without his or her reading glasses, and people who experience difficulties in particular situations, such as a person who works in a noisy environment or has both hands occupied by other activities. This part of ISO 9241 is prepared as guidance to secure and improve accessibility to ICT equipmen
40、t, software and services when they are used by people within the widest range of capabilities. It presents: a) a framework based on the ergonomic concept of context of use, and b) principles for the accessibility of ICT equipment and services. Their presentation is intended to assist the users of th
41、is part of ISO 9241 in the consideration of accessibility issues. It also describes major product attributes with design examples, provides information for the planning, design and development of ICT equipment and services and acquisition and evaluation of ICT equipment and services. It recognizes t
42、he importance of following general ergonomic guidance as well as the more accessibility-specific guidance found in this and other accessibility-specific standards in achieving full use of ICT equipment, software and services. While many of the requirements and recommendations in this part of ISO 924
43、1 also apply outside the domain of accessibility, they are especially important to this domain. The checklist of Annex B has also been included to help users examine the accessibility features of ICT equipment and services. BS EN ISO 9241-20:2009INTERNATIONAL STANDARD ISO 9241-20:2008(E) ISO 2008 Al
44、l rights reserved 1Ergonomics of human-system interaction Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services 1 Scope This part of ISO 9241 is intended for use by those responsible for planning, designing, developing, acquiring, and evaluating info
45、rmation/communication technology (ICT) equipment and services. It provides guidelines for improving the accessibility of ICT equipment and services such that they will have wider accessibility for use at work, in the home, and in mobile and public environments. It covers issues associated with the d
46、esign of equipment and services for people with a wide range of sensory, physical and cognitive abilities, including those who are temporarily disabled, and the elderly. A detailed design for particular equipment or a service can be developed based on its recommendations. If a specific detailed stan
47、dard exists concerning the accessibility of equipment or services, then it can be used in conjunction with that more specific standard. Where such standards are not available, this part of ISO 9241 can then form the basis for the design of the accessibility features of ICT equipment and services. It
48、 also provides general guidelines for acquiring and evaluating ICT equipment and services, including both hardware and software aspects of information processing equipment, electronic communication facilities, office machines, and other similar technologies and services, used at work, in the home, a
49、nd in mobile and public environments. In addition, it gives important information about context of use. Accessibility is increased by expanding the range of contexts where equipment and services can be used. Context of use can result from the various components of the equipment or service, including user, task and equipment (hardware, software and materials) characteristics, as well as those of physical and social environments. Context of use can be considered when planning, designin
