The invention of typography, print, and more recently digitization and the internet brought about an abundance of documents and made the need for legible communication unquestionable. The stakes are as high as the numbers of documents and readers. Professional typographers, graphic designers, UX designers, DTP operators, software developers, casual users of word-processing software, all in one way or another design documents thus affecting their ease of reading. But what exactly is legibility and how can we design documents that are easier to read?

Traditional typographic knowledge based on conventions, technology, and personal or shared experience claims reliable answers proven by generations. Next to this, there has been a growing body of scientific research aiming to provide testable theories to critically assess such answers. Often scattered across journals and scholarly monographs, contemporary research may have been hard to access and digest by non-researchers.

Mary Dyson spent most of her academic life at the renowned Department of Typography & Graphic Communication at the University of Reading (UK). She has dedicated her career to research into reading and typography, writing numerous papers on the subject.

In front of you is a digital version of her comprehensive introduction to legibility. It updates and extends existing books summarising contemporary legibility research in an accessible form. Available in English and Spanish, under a permissive licence (CC BY-NC-ND 4.0), it is a prime resource on typographic legibility available online. The work is formulated as a textbook encouraging critical reading. The complex research content is divided into panels providing additional material or explanation and boxes describing the details of experiments.

The project would not be possible without the generosity of the original publisher and editor María González de Cossío from Centro de Estudios Avanzados de Diseño (Puebla, México) and financial support of Google Fonts. The production work for the digital edition was done under the auspices of Rosetta Type with most of the heavy lifting executed by Johannes Neumeier. With further thanks to Sofie Beier, Jeanne-Louise Moys, Carlos Pérez Cerón, Kevin Larson, and Tania Chacana (see acknowledgements).

One cannot overstate the importance of its publication online. I believe it will have a profound impact on web typography and typographic discourse online, but it would be just as fine if you find it useful for your thinking, practice, or research.

— David Březina, Rosetta Type, May 2023

What others say

Typography matters. It can enhance or ruin our reading experience. In this captivating book, Mary Dyson reveals the science and art of legibility, based on her expertise as a cognitive psychologist. Whether you are a designer, a researcher, or a reader, you will find valuable insights and tips in this book.

— Kevin Larson, Principal researcher at Microsoft Advanced Reading Technologies

This is a much needed and anticipated resource that I hope reaches many professionals beyond typography researchers. The volume of information that we receive globally on a daily basis is immense but only a small part is legible and supports ease of reading and retention of information. Legibility is needed more than ever, if we are expected to keep up with the pace of technological progress and fast information dissemination.

The wealth of knowledge Mary Dyson brings to this book, together with the perfect combination of psychology with perception and typographic design, make this book distinguishable and timeless – a resource that will be on our bookshelves or desktops for many years to come. The design of the book, itself applying legibility principles and using a tasteful selection of design elements, make this book accessible, engaging and inclusive of all possible readers.

Read, share, teach, apply… all that Mary Dyson is sharing with us in this key resource.

— Maria Lonsdale, Professor of Information & Communication Design, University of Leeds

Written in a clear and concise manner, this is a book like no other on the topic of text legibility. Mary C. Dyson, an expert in the field, combining vast teaching and research experience managed to produce an engaging and informative work about a complex and challenging topic. The quality content, organised and designed in an accessible style, constitutes a valuable resource and a must-read book for anyone studying, teaching, or practising typography.

— Klimis Mastoridis, Professor of Typography and Graphic Communication, University of Nicosia

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