An award-winning collaborative, global project.

The Readability Guidelines wiki launched in 2019 as a collaborative project, bringing together content professionals from around the world to build evidence-based guidance for anyone making content decisions.

The guidelines have not been updated since 2020, so we've made the decision to retire this wiki on 8th June 2026.

Our sincere thanks to everyone who gave their time and expertise to this project. Your work helped people make better content decisions.

We at CDL still believe content decisions should be grounded in evidence. We hope to bring something new to this space in the future.

Visit us at contentdesign.london.

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Readability Guidelines

Last updated: 7 January, 2020

"Imagine a collaboratively developed, universal content style guide, based on usability evidence." Sarah Winters, project founder.


Wiki sections


Project background

Sarah Winters of Content Design London asked in 2018 if working together we can create evidence-based style readability guidance. Read the first blog post about the project. Watch the London Accessibility MeetUp talk.

This wiki was collaboratively researched, and authored by Lizzie Bruce.

Content collaborators in multiple sectors:


Get involved

How to join in:

To share links to usability studies, use the comment section of the relevant wiki topic page.


Wiki comments and edits

This is a totally open project. You're welcome to comment on, and suggest edits for wiki pages. Please:

  • be respectful,

  • support positive open learning with your comments,

  • include usability evidence with your comments,

  • read current wiki pages carefully and review existing evidence before making edit suggestions.

Any other comments or queries, please get in touch on twitter @ContentDesignLN.