As being defined by J. J. Gibson, “ Affordance is states that the world is perceived not only in terms of object shapes and spatial relationships but also in terms of object possibilities for action (affordances) — perception drives action. “. In other words, it is a visual clue to the function of an object. For an example, imagine a door that only opens in one direction. The door doesn't have a handle, thus it can't be pulled - it is visually perceived to be push only. If the door has a fixed-handle, then of course we know that it needs to be grasped and pulled.
Users know exactly they should do or should not do just by looking in the absent of pictures, labels, illustration or even instruction.
Wrapping up, I would say that a perceived affordance isn't a simple attribute that you either have or you don't. It is such a long, wide road of potential effectiveness. Just because object affords behavior doesn't necessarily mean it affords it well.
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