Many objects, such as tools and
household appliances, are designed to afford us their proper use and constrain
us from using them improperly. Affordance makes it easy to do the right thing,
while constraints make it difficult to do the wrong thing. - Travis Lowdermilk.
User-Centered Design. O’Reilly Media.
The term affordance refers to the perceived and actual properties that determine
just how the thing could possibly be used. Affordances provide strong clues to
the operations of things. For example, knobs are for turning. - Donald A.
Norman . The Design of Everyday Things.
and wheels are for turning.
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