It is a quality of an object, or an environment, that allows an individual to perform an action
The term is used in a variety of fields: perceptual psychology, cognitive psychology, environmental psychology, industrial design, human–computer interaction (HCI), interaction design and artificial intelligence
If you see a bench, you might think to sit down on it, or to lie down on it
Some doors have a panel on one side, and a handle on the other
If you see the panel, you think to push it
http://encyclopedia.thefreedictionary.com/Affordances
www.communitywiki.org/en/WhatIsAffordance
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