Affordances and Design
http://jnd.org/dn.mss/affordances-and-design.html

Norman, Donald A.
JND.org
2002

Abstract:

The word 'affordance' was originally invented by the perceptual psychologist J. J. Gibson (1977, 1979) to refer to the actionable properties between the world and an actor (a person or animal). To Gibson, affordances are a relationship. They are a part of nature: they do not have to be visible, known, or desirable. Some affordances are yet to be discovered. Some are dangerous. I suspect that none of us know all the affordances of even everyday objects.