ISO 21801-1-2020 PDF

Full title and description

ISO 21801-1:2020 — Cognitive accessibility — Part 1: General guidelines. This International Standard gives guidance for the design and development of cognitively accessible systems, including products, services and the built environment; it is intended to reduce barriers that prevent people with cognitive disabilities (and others) from using systems effectively and safely.

Abstract

This document presents general guidelines to promote cognitive accessibility across a wide range of systems (fixed products, ICT systems, consumer products, applications and built environments). The guidance is aimed at mainstream systems as well as systems designed specifically for people with disabilities; it focuses on reducing cognitive load, improving clarity, predictability and error tolerance, and ensuring information and controls are understandable and usable.

General information

• Status: Published (International Standard).
• Publication date: January 2020 (published 13 January 2020 in listings).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 11.180.01 (Aids for disabled and handicapped persons; accessibility).
• Edition / version: Edition 1 (2020).
• Number of pages: 22 pages (PDF/print edition).

Scope

ISO 21801-1:2020 provides guidelines for designing and developing systems so that they are cognitively accessible: it addresses presentation of information, interaction design, instructions, signage and controls, use of plain language, error messages and feedback, and considerations for personalization and individualization where appropriate. The scope covers both non‑computerized products (e.g., manuals, consumer goods) and computerized systems (ICT, apps, smart devices) and combinations thereof.

Key topics and requirements

• Principles of cognitive accessibility: reduce complexity, support recognition over recall, provide clear structure and consistent layouts.
• Language and content: use plain language, short sentences, clear labeling and meaningful icons; provide multimodal information where helpful.
• Interaction and controls: predictable behavior, visible affordances, simple navigation and clear feedback for user actions.
• Error tolerance and recovery: helpful, non‑blaming error messages and clear remediation steps.
• Documentation and signage: easy‑to‑understand instructions, step‑by‑step procedures and consistent signage conventions.
• Personalization and adaptability: support user preferences and adjustable complexity or assistance levels where feasible.
• Applicability: guidance applies across products, services, software, appliances and built environments; some recommendations are type‑specific (fixed product vs ICT vs adaptive systems).
• Reporting and conformance: recommendations in Part 1 are supported by ISO 21801‑2 (Reporting) for documenting cognitive accessibility characteristics.

Typical use and users

ISO 21801-1 is typically used by product designers, UX/UI designers, interaction designers, technical authors, accessibility specialists, architects and planners, procurement teams, manufacturers, and regulatory or standards bodies seeking to incorporate cognitive accessibility considerations into product and service design. It is also useful for testing and certification bodies that evaluate accessibility.

Related standards

Key related documents include ISO 21801-2 (Cognitive accessibility — Part 2: Reporting) which specifies how to record/report cognitive accessibility characteristics, and regional adoptions such as EN/BSI adoptions (EN ISO 21801-1:2021 / BS EN ISO 21801-1:2021). Other adjacent standards and guidance that are commonly used together include ISO ergonomics and human‑system interaction standards (ISO 9241 series) and web/content accessibility guidelines like WCAG for digital content.

Keywords

cognitive accessibility, accessibility, usability, plain language, user experience (UX), interaction design, assistive products, inclusive design, error tolerance, documentation, signage, ISO 21801.

FAQ

Q: What is this standard?

A: ISO 21801-1:2020 is an International Standard providing general guidelines to make systems (products, services, built environments and digital systems) cognitively accessible to a broad range of users, including people with cognitive disabilities.

Q: What does it cover?

A: It covers design and development guidance—content clarity, interaction design, labeling and signage, instructions, error handling, personalization and other measures that reduce cognitive barriers across fixed and computerized systems.

Q: Who typically uses it?

A: Designers, accessibility practitioners, product teams, technical writers, architects, procurement specialists, regulators and test laboratories use the standard to integrate cognitive accessibility into products, services and environments.

Q: Is it current or superseded?

A: ISO 21801-1:2020 is a current published International Standard (first edition, 2020); ISO periodically reviews standards and this document was published in 2020 and remains the active Part 1 document for the ISO 21801 series.

Q: Is it part of a series?

A: Yes — it is Part 1 of the ISO 21801 series on cognitive accessibility. Part 2 (ISO 21801-2:2022) covers reporting of cognitive accessibility characteristics; additional parts may address other specific topics within the series.

Q: What are the key keywords?

A: Cognitive accessibility, inclusive design, usability, plain language, user-centred design, assistive products, accessibility reporting, ISO 21801.