The false dichotomy between accessibility and usability

Traditionally, accessibility researchers have focused on the barrier-free designs that make information available to a diverse set of user abilities and constraints. Usability practitioners and researchers have focused their efforts on making information interfaces usable by the average abled-bodied user. The problem in this dichotomy is the myth of two assumptions. First, there is the myth of the "average" user. The first rule about psychology experiments is that often the individual subject variations in an experiment often overwhelm any effects that you're attempting to observe. We use the "average user" as a concept so that we have a prototypical user to design for, when in fact, often we're designing for a set of different user persona, use cases, and skill levels. Second, there is the myth of "barrier-free" design. Design is inherently an exercise in which we optimize for a certain set of use cases, while de-emphasizing other less important use cases. As a result, a design can never be entirely "barrier-free". If we treat this dichotomy as false, we start to realize that a whole set of problems between the two fields are one and the same. If we reject the dichotomy, then we see that many accessibility problems are also usability problems, and vice versa. For example, language barriers in social media, mobile devices and their ease of use while walking, and the ability to input text using voice rather than typing are all accessibility and usability problems. To emphasize, usability and accessibility are both fundamentally about the ability to get at information resources and knowledge. Broadly, I see many opportunities to bridge this false dichotomy and will attempt to give examples during this talk.