read this: http://thedigitalcommons.org/docs/hendren-all-technology-is-assistive.pdf.
sarah makes the case that whenever we make something, we’re making to address a deficit (disability).
she also makes the case for ‘extreme-users’, something that was a big part of my work & philosophy in india; as i did & taught design-research for behaviour-design.

also saw tongue-assisted wheelchair moving mechanism, by georgia tech.