ISO/IEC 29138-1:2018
(Main)Information technology — User interface accessibility — Part 1: User accessibility needs
Information technology — User interface accessibility — Part 1: User accessibility needs
This document identifies a collection of user accessibility needs that diverse users have of ICT systems to make these systems accessible to them. Each user accessibility need might be required of a system by an individual. Different users can have different sets of user accessibility needs in different contexts. While this set of user accessibility needs was developed for the domain of ICT, many of the user accessibility needs in this set also apply in other domains. This document does not provide requirements or specific processes and methods for the application and evaluation of user accessibility needs. However, it could inform the development of such requirements (see 5.4). This document is not designed for certification purposes or regulatory or contractual use. The user accessibility needs in this document are intended to inform and encourage those responsible for accessibility to go beyond the minimum provisions of accessibility legislation and regulations.
Technologies de l'information — Accessibilité de l'interface utilisateur — Partie 1: Besoins d'accessibilité de l'usager
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INTERNATIONAL ISO/IEC
STANDARD 29138-1
First edition
2018-11
Information technology — User
interface accessibility —
Part 1:
User accessibility needs
Technologies de l'information — Accessibilité de l'interface
utilisateur —
Partie 1: Besoins d'accessibilité de l'usager
Reference number
©
ISO/IEC 2018
© ISO/IEC 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2018 – All rights reserved
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Accessibility goals . 3
5 User accessibility needs and related information . 4
5.1 General . 4
5.1.1 Needs . 4
5.1.2 Some users need . 5
5.2 The organization of this set of user accessibility needs . 5
5.2.1 Organization based on accessibility goals . 5
5.2.2 Heuristics for the organization of this set of user accessibility needs . 5
5.3 Detailed information on needs . 6
5.3.1 The statement of the need . 6
5.3.2 Need identifier . 6
5.3.3 Description of the need . 6
5.3.4 Instances of the need . 7
5.3.5 Examples of the need . 7
5.3.6 Examples of an instance . 7
5.3.7 Short versions of the needs and their instances . 7
5.4 Applying the needs . 7
5.4.1 Users and uses of the set of needs . 7
5.4.2 General activities involving user needs . 7
5.4.3 Identifying system and context specific user needs . 8
5.4.4 Developing system requirements . 8
5.4.5 Evaluating systems . . 8
6 Details of the user accessibility needs . 9
6.1 Details of the needs related to suitability for the widest range of users. 9
6.1.1 To recognize that they are included as a system user within diverse contexts . 9
6.1.2 To have accessible support for using the system . 9
6.1.3 To have the system accessible to an individual with combinations of needs .10
6.2 Details of the needs related to conformity with user expectations .10
6.2.1 To not be surprised by the results of interactions with the system.10
6.2.2 To apply personal knowledge and experience to interact successfully with
the system .11
6.2.3 To receive instruction or training directed at preparing users for new
knowledge needed to interact successfully with the system .11
6.2.4 To obtain immediate and easily accessible help or further instructions,
where such help can be provided by the system.11
6.3 Details of the needs related to support for individualization .12
6.3.1 To be provided with (and to choose) the way of interacting with a system
that best works for them (including activating and deactivating built-in
accessibility features) .12
6.3.2 To choose between the available input/output modalities and their
configuration without requiring restart of the system .12
6.3.3 To have simultaneous use of alternate interaction modalities .13
6.3.4 To be provided with information on available options for interacting with
a system on which to base a choice of interaction methods .13
6.3.5 To be provided an accessible means to choose individualization features .13
6.3.6 To have individualization features maintained for future uses of the
system, until changed by the user .14
© ISO/IEC 2018 – All rights reserved iii
6.3.7 To have the system use complete standardized sets of needs or
preferences from specific standards .14
6.3.8 To take or give up control of functions that could be performed by either
the user or the system .15
6.3.9 To have the option to use the system with a minimum of setup or
configuration .15
6.4 Details of the needs related to approachability .15
6.4.1 To have the system free from any physical barriers .15
6.4.2 To have the system free from any psychological barriers .16
6.4.3 To have the system maintain the user's attention .16
6.4.4 To have interaction options clearly presented .17
6.4.5 To have appropriate levels of privacy and security .17
6.4.6 To avoid patterns that cause psychological or physical discomfort or
disturbance .17
6.4.7 To use the system remotely as well as directly .18
6.4.8 To have the system free from environmental barriers .18
6.5 Details of the needs related to perceivability .19
6.5.1 To use a specific sensory modality (or a set of specific modalities) to
perceive information .19
6.5.2 To have information presented visually .19
6.5.3 To have visual information available in other modalities .19
6.5.4 To have information presented in auditory form .20
6.5.5 To have audio information available in other modalities .21
6.5.6 To have information in tactile form .21
6.5.7 To have tactile information available in other modalities .22
6.5.8 To experience information via multiple simultaneous modalities .22
6.5.9 To have presentation attributes of a modality that match an individual's needs .22
6.5.10 To have presentation attributes specific to the visual modality that match
an individual's needs .23
6.5.11 To have manageable textual material .24
6.5.12 To have sign language perceivable .24
6.5.13 To have 3-dimensional visual information presented using only two
dimensions .24
6.5.14 To have presentation attributes specific to the auditory modality that
match an individual's needs .25
6.5.15 To select/deselect different audio streams .25
6.5.16 To have presentation attributes specific to the tactile modality that match
an individual's needs .26
6.5.17 To have visual or tactile feedback occur at the same location as the control .26
6.5.18 To distinguish among the different components of information that are
being presented .26
6.5.19 To distinguish between different components without them interfering
with one another.26
6.5.20 To prevent actions which would decrease information perceivability .27
6.5.21 To locate and identify all actionable components without activating them .27
6.5.22 To be able to distinguish between actionable and non- actionable
components in any modality .
...
INTERNATIONAL ISO/IEC
STANDARD 29138-1
First edition
2018-11
Information technology — User
interface accessibility —
Part 1:
User accessibility needs
Technologies de l'information — Accessibilité de l'interface
utilisateur —
Partie 1: Besoins d'accessibilité de l'usager
Reference number
©
ISO/IEC 2018
© ISO/IEC 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2018 – All rights reserved
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Accessibility goals . 3
5 User accessibility needs and related information . 4
5.1 General . 4
5.1.1 Needs . 4
5.1.2 Some users need . 5
5.2 The organization of this set of user accessibility needs . 5
5.2.1 Organization based on accessibility goals . 5
5.2.2 Heuristics for the organization of this set of user accessibility needs . 5
5.3 Detailed information on needs . 6
5.3.1 The statement of the need . 6
5.3.2 Need identifier . 6
5.3.3 Description of the need . 6
5.3.4 Instances of the need . 7
5.3.5 Examples of the need . 7
5.3.6 Examples of an instance . 7
5.3.7 Short versions of the needs and their instances . 7
5.4 Applying the needs . 7
5.4.1 Users and uses of the set of needs . 7
5.4.2 General activities involving user needs . 7
5.4.3 Identifying system and context specific user needs . 8
5.4.4 Developing system requirements . 8
5.4.5 Evaluating systems . . 8
6 Details of the user accessibility needs . 9
6.1 Details of the needs related to suitability for the widest range of users. 9
6.1.1 To recognize that they are included as a system user within diverse contexts . 9
6.1.2 To have accessible support for using the system . 9
6.1.3 To have the system accessible to an individual with combinations of needs .10
6.2 Details of the needs related to conformity with user expectations .10
6.2.1 To not be surprised by the results of interactions with the system.10
6.2.2 To apply personal knowledge and experience to interact successfully with
the system .11
6.2.3 To receive instruction or training directed at preparing users for new
knowledge needed to interact successfully with the system .11
6.2.4 To obtain immediate and easily accessible help or further instructions,
where such help can be provided by the system.11
6.3 Details of the needs related to support for individualization .12
6.3.1 To be provided with (and to choose) the way of interacting with a system
that best works for them (including activating and deactivating built-in
accessibility features) .12
6.3.2 To choose between the available input/output modalities and their
configuration without requiring restart of the system .12
6.3.3 To have simultaneous use of alternate interaction modalities .13
6.3.4 To be provided with information on available options for interacting with
a system on which to base a choice of interaction methods .13
6.3.5 To be provided an accessible means to choose individualization features .13
6.3.6 To have individualization features maintained for future uses of the
system, until changed by the user .14
© ISO/IEC 2018 – All rights reserved iii
6.3.7 To have the system use complete standardized sets of needs or
preferences from specific standards .14
6.3.8 To take or give up control of functions that could be performed by either
the user or the system .15
6.3.9 To have the option to use the system with a minimum of setup or
configuration .15
6.4 Details of the needs related to approachability .15
6.4.1 To have the system free from any physical barriers .15
6.4.2 To have the system free from any psychological barriers .16
6.4.3 To have the system maintain the user's attention .16
6.4.4 To have interaction options clearly presented .17
6.4.5 To have appropriate levels of privacy and security .17
6.4.6 To avoid patterns that cause psychological or physical discomfort or
disturbance .17
6.4.7 To use the system remotely as well as directly .18
6.4.8 To have the system free from environmental barriers .18
6.5 Details of the needs related to perceivability .19
6.5.1 To use a specific sensory modality (or a set of specific modalities) to
perceive information .19
6.5.2 To have information presented visually .19
6.5.3 To have visual information available in other modalities .19
6.5.4 To have information presented in auditory form .20
6.5.5 To have audio information available in other modalities .21
6.5.6 To have information in tactile form .21
6.5.7 To have tactile information available in other modalities .22
6.5.8 To experience information via multiple simultaneous modalities .22
6.5.9 To have presentation attributes of a modality that match an individual's needs .22
6.5.10 To have presentation attributes specific to the visual modality that match
an individual's needs .23
6.5.11 To have manageable textual material .24
6.5.12 To have sign language perceivable .24
6.5.13 To have 3-dimensional visual information presented using only two
dimensions .24
6.5.14 To have presentation attributes specific to the auditory modality that
match an individual's needs .25
6.5.15 To select/deselect different audio streams .25
6.5.16 To have presentation attributes specific to the tactile modality that match
an individual's needs .26
6.5.17 To have visual or tactile feedback occur at the same location as the control .26
6.5.18 To distinguish among the different components of information that are
being presented .26
6.5.19 To distinguish between different components without them interfering
with one another.26
6.5.20 To prevent actions which would decrease information perceivability .27
6.5.21 To locate and identify all actionable components without activating them .27
6.5.22 To be able to distinguish between actionable and non- actionable
components in any modality .
...
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