1、STD*BSI BS EN IS0 92VL-LL-ENGL 1778 1b24bb7 0787095 7TV BRITISH STANDARD Ergonomic requirements for office work with visual display terminals (VDTS) - Part 11: Guidance on usability The European Standard EN IS0 9241-11:1998 has the status of a British Standard ICS 13.180; 35.180 BS EN IS0 9241-11:19
2、98 Incorporating Amendment No. I NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 9241-111998 Amd.No. I Date Environment Sector Board, National foreword Comments This British Standard is the English language version of EN IS0 9241-11:1998. It is identical with IS0 924
3、1-11:1998. The UK participation in its preparation was entrusted by Technical Committee PH19, Applied ergonomics, to Subcommittee PH/9/6, User system interfaces, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible international/European committee any
4、 enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-referenc
5、es Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this d
6、ocument may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users o
7、f British Standards are responsible for their correct application. Compliance with a British Standard does not of itseIf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN IS0 title page, page 2, the IS0 title
8、 page, pages ii to iv, pages 1 to 19 and a back cover. The BSI copyright notice displayed throughout this document indicates when the document was last issued. lhie British Standd. having been DreDared under the Amendments issued since publication was published under I I the authority of the Standar
9、ds 10459 I July 1999 I Annex ZA added Board and comes into effect on 15June 1998 O BSI 07-1999 ISBN O 580 28844 7 l I BS EN IS0 9241-11:1998 Contents Page National foreword Inside hnt cover Foreword 2 Text of EN IS0 9241-11 1 O BSI 07-1999 i STDoBSI BS EN IS0 924L-LL-ENGL 1998 W LbZLibb9 0787098 Li0
10、3 E EUROPEAN STANDARD EN IS0 9241-11 NORME EUROPENNE March 1998 EUROPISCHE NORM ICs 13.180; 35.180 Descriptors: See IS0 document English version Ergonomic requirements for office work with visual dispIay terminals (VDTs) - Part 11: Guidance on usability (IS0 9241-11: 1998) Exigences ergonomiques pou
11、r travail de bureau avec terminaux crans de visualisation (TEV) - Partie 11: Lignes directrices concernant lutilisabilit (IS0 9241-11:1998) This European Standard was approved by CEN on 5 March 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condit
12、ions 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 Central Secretariat or to any CEN member. This European Standard exists in three o
13、fficial 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austri
14、a, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central S
15、ecretariat: rue de Stassart 36, B-1050 Brussels 0 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 9241-11:1998 E STD-BSI BS EN IS0 92lL-LL-ENGL 1998 D Lb24bb9 0787099 3iT EN IS0 9241-11:1998 Foreword The text of the Intern
16、ational Standard IS0 9241-11:1998 has been prepared by Technical I Committee ISOPTC 159, Ergonomics, in collaboration with CENICS. 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 September 1998, a
17、nd conflicting national standards shall be withdrawn at the latest by September 1998. According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
18、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 9241-11:1998 was approved by CEN as a European Standard without any modification. NOTE Normati
19、ve references to international standards are I listed in annex ZA (normative). 8 BSI 07-1999 2 STD.BSI BS EN IS0 92ql-LL-ENGL 3998 Lb2qbb9 0787300 991 EN IS0 9241-1ki998 INTERNATIONAL STANDARD IS0 9241 -1 1 First edition 1998-03-1 5 Ergonomic requirements for off ice work with visual display termina
20、ls (VDTs) - Part 11: Guidance on usability Exigences ergonomiques pour travail de bureau avec terminaux crans de visualisation (TECI) - Pattie 1 1: Lignes directrices relatives a iutilisabilit Reference number IS0 9241-11:1998(E) STD-BSI BS EN IS0 72VL-LI-ENGL 1978 D Lb24bb7 0787LOL 828 = EN IS0 924
21、1-111998 Contents Foreword Introduction 1 Scope 2 Normative reference 3 Definitions 4 Rationale and benefits 5 Specifying and measuring the usability of products 6 Specification and evaluation of usability during design 7 Spec-g and measuring a work system in use Annex A (informative) Example of how
22、 to specify the context of use Annex B (informative) Examples of usability measures Annex C (informative) Example of a usability requirements specification Annex D (informative) Relationship to other International Standards Annex E (informative) Bibliography Figure 1 - Usability framework Figure 2 -
23、 Usability activities and associated documents Table A.l- Example of attributes of the context of use Table B.l- Examples of measures of usability Table B.2 - Examples of measures for desired properties of the product Table C.1- User characteristics Page 1 1 1 2 2 3 5 6 . Ill 8 9 12 16 17 3 7 8 9 10
24、 13 Descriptors: Ergonomics, ofce machines, computer peripheral equipment, text processing, data terminal equipment. display devices, specifications, reflection. 8 BSI 07-1999 ll STD.BS1 BS EN IS0 92qL-LL-ENGL 1998 D Lh24bb9 0787102 ibll EN IS0 9241-11:1998 Foreword IS0 (the International Organizati
25、on for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established ha
26、s the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draf
27、t International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Internationa1 Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 9241-1 1 was prepared by Technical Committee ISOPT
28、C 159, Ergonomics, Subcommittee SC 4, Ergonomics of humait-system interaction. IS0 9241 consists of the following 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
29、 3: Visual display requirements; - Part 4: Keyboard requirements; - Part 5: Workstation layout aiid postural requirements; - Part 6: Environmental requirements; - Part 7: Requirements for display with reflections; - Part 8: Requirements for displayed colours; - Part 9: Requirements for non-keyboard
30、input devices; - Part 10: Dialogue principles; - Part 11: Guidance oii usability; - Part 12: Presentation of information; . - Part 13: User guidance; -Part 14: Menu dialogues; - Part 15: Commaiid dialogues; - Part 16: Direct manipulation dialogues; - Part 17: Form-filling dialogues. Annex A to Annex
31、 E of this part of IS0 9241 are for information only. . 8 BSI 07-1999 Ill STDOBSI BS EN IS0 72q1-11-ENGL 1778 D lb2qbb7 0787303 bTO D EN IS0 9241-11:1998 Introduction The objective of designing and evaluating visual display terminals for usability is to enable users to achieve goals and meet needs i
32、n a particular context of use. IS0 9241-11 explains the benefits of measuring usability in terms of user performance and satisfaction. These are measured by the extent to which the intended goals of use are achieved, the resources that have to be expended to achieve the intended goals, and the exten
33、t to which the user finds the use of the product acceptable. IS0 9241-11 emphasizes that visual display terminal usability is dependent on the context of use and that the level of usability achieved will depend on the specific circumstances in which a product is used. The context of use consists of
34、the users, tasks, equipment (hardware, software and materials), and the physical and social environments which may all influence the usability of a product in a work system. Measures of user performance and satisfaction assess the overall work system, and, when a product is the focus of concern, the
35、se measures provide information about the usability of that product in the particular context of use provided by the rest of the work system. The effects of changes in other components of the work system, such as the amount of user training, or the improvement of the lighting, can also be measured b
36、y user performance and satisfaction. The term usability is sometimes used to refer more narrowly to the attributes of a product which make it easier to use (see Annex D). Requirements and recommendations relating to the attributes of the hardware, software and environment which contribute to visual
37、display terminal usability, and the ergonomic principles underlying them, are provided in other parts of IS0 9241. 1 Scope IS0 9241-11 defines usability and explains how to identify the information which is necessary to take into account when speciSring or evaluating usability of a visual display te
38、rminal in terms of measures of user performance and satisfaction. Guidance is given on how to describe the context of use of the product (hardware, software or service) and the relevant measures of usability in an explicit way. The guidance is given in the form of general principles and techniques,
39、rather than in the form of requirements to use specific methods. The guidance in IS0 9241-11 can be used in procurement, design, development, evaluation, and communication of information about usability. IS0 9241-11 includes guidance on how the usability of a product can be specified and evaluated.
40、It applies both to products intended for general application and products being acquired for or being developed within a specific organization. IS0 9241-11 also explains how measures of wer performance and satisfaction can be used to measure how any component of a work system affects the whole work
41、system in use. The guidance includes procedures for measuring usability but does not detail all the activities to be undertaken. Specification of detailed user-based methods of measurement is beyond the scope of IS0 9241-11, but further information can be found in Annex B and the bibliography in Ann
42、ex E. IS0 9241-11 applies to office work with visual display terminals. It can also apply in other situations where a user is interacting with a product to achieve goals. IS0 9241-12 to IS0 9241-17 provide conditional recommendations which are applicable in specific contexts of use. The guidance in
43、this Part of IS0 9241 can be used in conjunction with IS0 9241-12 to IS0 9241-17 in order to help identify the applicability of individual recommendations. IS0 9241-11 focuses on usability and does not provide comprehensive coverage of all objectives of ergonomic design referred to in IS0 6385. Howe
44、ver, design for usability will contribute positively to ergonomic objectives, such as the reduction of possible adverse effects of use on human health, safety and performance. IS0 9241-11 does not cover the processes of system development. Human-centred design processes for interactive systems are d
45、escribed in IS0 13407. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of IS0 9241. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements
46、 based on this part of IS0 9241 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 6385:1981, Ergonomic requirements in the design of work systems
47、. 8 BSI 07-1999 1 STb-BSI BS EN IS0 72q3-33-ENGL 3778 II lb24669 078730q 537 W EN IS0 9241-111998 3 Definitions For the purposes of this part of IS0 9241, the following denitions apply: 3.1 usability extent to which a product can be used by specified users to achieve specified goals with effectivene
48、ss, efficiency and satisfaction in a specified context of use NOTE See Annex D for other approaches to usability. 3.2 effectiveness accuracy and completeness with which users achieve specified goals 3.3 efficiency resources expended in relation to the accuracy and completeness with which users achie
49、ve goals 3.4 satisfaction freedom from discomfort, and positive attitudes towards the use of the product 3.5 context of use users, tasks, equipment (hardware, software and materials), and the physical and social environments in which a product is used 3.6 work system system, consisting of users, equipment, tasks and a physical and social environment, for the purpose of achieving particular goals NOTE The context of use consists of those components of the work system which are treated as given when specifiing or measuring usability. 3.7 user person who interacts
