The False Dichotomy between Accessibility and Usability
Ed H. Chi · 2013 · Proceedings of the 10th International Cross-Disciplinary Conference on Web Accessibility (W4A) · doi:10.1145/2461121.2461146
Summary
This keynote paper by Ed H. Chi of Google argues that the traditional separation between accessibility research and usability/HCI research is a false dichotomy built on two myths. The first myth is the "average user" — HCI research inherited this concept from psychology, designing for a prototypical able-bodied user when in reality individual variation is enormous and everyone experiences reduced capacity situationally. All users age and experience declining perceptual abilities; noisy environments reduce speech input capacity; walking reduces mobile text entry ability; traveling to a foreign country creates language and interface barriers. The second myth is "barrier-free" or "universal" design — design is inherently an optimisation exercise that must make trade-offs between use cases, so no design can ever be entirely barrier-free. Chi argues these myths have created two research communities that do not talk to each other, to the detriment of both fields.
Key findings
Chi identifies that the artificial boundary between accessibility and usability is unproductive for both fields. HCI research, by pretending to focus on able-bodied users, ignores a large set of important use cases — language barriers in social media, mobile device use while walking, voice input as an alternative to typing are all simultaneously accessibility and usability problems. Accessibility research, by insisting on universal barrier-free designs, risks focusing on theoretical and philosophical issues that are essentially impossible to solve, rather than pursuing practical solutions that benefit both disabled and non-disabled users. Chi proposes that rejecting the dichotomy reveals many problems are shared: both fields are fundamentally about the ability to access information resources and knowledge. He calls for tighter integration of research agendas between the two communities, arguing this would advance both fields' long-term goals.
Relevance
This paper articulates an argument that has gained significant traction in the years since its publication: that accessibility and usability exist on a continuum rather than as separate disciplines. The concept of situational disability — where environmental or contextual factors temporarily reduce anyone's abilities — has become a powerful framing for making the case for accessibility to organisations that might otherwise see it as a niche concern. For practitioners, the key takeaway is that accessibility work should not be siloed from UX and usability work; the same research methods, design principles, and evaluation approaches apply across the spectrum of human ability. The paper also offers a useful corrective to over-reliance on "universal design" as a concept — acknowledging that all design involves trade-offs encourages more honest and practical conversations about which use cases to prioritise and how to address the ones that are deprioritised.
Tags: usability · accessibility theory · universal design · inclusive design · human-computer interaction · design theory