ISO 9241-171-2008 PDF

Full title and description

Ergonomics of human–system interaction — Part 171: Guidance on software accessibility. This international standard provides guidance and requirements for designing accessible software so that interactive systems (desktop, web, mobile, learning and library systems, etc.) can be used by people with the widest range of physical, sensory and cognitive abilities, including those who are temporarily or situationally disabled and older users.

Abstract

ISO 9241-171:2008 gives ergonomics guidance for the accessibility of software applications and platforms, addressing user needs, design considerations, documentation and evaluation methods that increase usability for a wide range of users and contexts of use. It complements other ISO 9241 parts on usability and human–system interaction and does not specify requirements for assistive technologies themselves, but addresses their integration with interactive systems.

General information

• Status: Published in 2008; later revised/replaced by a newer edition (see FAQ).
• Publication date: 2008 (national publication dates vary; original international publication issued in 2008 — commonly recorded as October–December 2008 by several national bodies).
• Publisher: International Organization for Standardization (ISO); commonly distributed as EN ISO / national adoptions through CEN/ISO member bodies.
• ICS / categories: Ergonomics / human–system interaction (13.180) and Software (35.080).
• Edition / version: Edition 1 (2008).
• Number of pages: Varies by national publication/format (commonly reported in the range of approximately 104–112 pages).

Scope

ISO 9241-171:2008 is applicable to the accessibility of interactive systems and covers a wide range of software types (office, web, learning support, library systems, mobile apps, embedded HMIs, etc.). It provides guidance on designing software interfaces, content and interactions so they are accessible to people with visual, hearing, motor and cognitive impairments, and to those in temporary or situationally limiting conditions. The document complements general usability guidance in other parts of the ISO 9241 series but does not set requirements for assistive technologies themselves.

Key topics and requirements

• Principles of accessible software design and usability considerations for a broad spectrum of users.
• Design guidance for perceptual accessibility (visual and auditory) — e.g., alternative text, color and contrast, scalable text and audio cues.
• Support for motor and interaction accessibility — keyboard operability, adjustable timing, clear focus indicators and alternative input methods.
• Cognitive accessibility recommendations — clear language, predictable navigation, error prevention and support, and options to reduce cognitive load.
• Guidance on documentation, help, and user support that is accessible to diverse users.
• Recommendations for compatibility and integration with assistive technologies (while not specifying how assistive technologies should behave).
• Evaluation and conformance considerations to assist specification, design, development, procurement and testing activities.

Typical use and users

Primary users are software designers, UX/interaction designers, accessibility specialists, developers, QA/test teams, procurement officers and evaluators who need to specify or assess accessibility features in software products and platforms. The standard is also used by policy makers and organizations aiming to adopt consistent accessibility practices for internal and customer-facing systems.

Related standards

ISO 9241-171:2008 is part of the broader ISO 9241 series (ergonomics of human–system interaction) and is related to ISO 9241-11 (usability), ISO 9241-210 (human-centred design), ISO/TS 16071 (earlier guidance on accessibility, withdrawn/updated), ISO 14915 (multimedia and HCI) and various regional/national EN ISO adoptions. It is often used alongside web accessibility guidelines such as W3C WCAG for web-specific conformance.

Keywords

software accessibility, ergonomics, human–system interaction, usability, inclusive design, assistive technology integration, accessibility evaluation, ISO 9241, accessibility guidance

FAQ

Q: What is this standard?

A: ISO 9241-171:2008 is an international standard that gives guidance on designing accessible software so interactive systems can be used by people with a wide range of abilities and in diverse contexts of use.

Q: What does it cover?

A: It covers ergonomic and accessibility guidance for software user interfaces, documentation and related interaction design topics (visual, auditory, motor and cognitive accessibility), plus considerations for evaluation and integration with assistive technologies. It does not prescribe requirements for assistive technologies themselves.

Q: Who typically uses it?

A: UX and interaction designers, accessibility specialists, developers, testers, procurement teams, evaluators and policy makers who need authoritative guidance on software accessibility.

Q: Is it current or superseded?

A: The 2008 edition was the original ISO 9241-171 release. ISO has subsequently published a newer edition of this part (ISO 9241-171 with a later publication year), so users should check for the most recent edition for up-to-date requirements and guidance when planning compliance or procurement.

Q: Is it part of a series?

A: Yes — it is Part 171 of the ISO 9241 series (Ergonomics of human–system interaction), which includes multiple parts covering usability principles, human-centred design, input devices and other HCI topics.

Q: What are the key keywords?

A: software accessibility, ergonomics, inclusive design, usability, assistive technology integration, human–system interaction, accessibility evaluation.