Affordance, quality of that contained by the object or even the environment that allow people to perform certain action. In other word, it is a visual clue of the object to fulfill it function. People will what they need to react without thinking for so long with the affordance quality of the object.
The most common example in our diary life is the visual sign board that used for the traffic purpose. Traffic user like us can easily understand the function of specific sign board without thinking. This term is frequently used in the Human-Computer interaction (HCI) study.
This term was first introduce by psychologist, James J. Gilbson at 1977 in article "The Theory of Affordances". Affordance is defined as all "action possibilities" that contain by the environment by James J. Gilbson. The action that induced by the afforfance quality is totally independent of individual's ability to recognize them. Individual fail to recognize this qualities will fail to perform certain actoin and it mean the affordance quality of the object or environment is weak. Affordance need to be improve by time, change from bad to better so that the object and environment can successfully induced individual to perform the action.
Source of infomation: wikipedia.org
dictionary.reference.com
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