Sometimes There Are Thing You Need To Decide.Affordance

Affordance is something that allow user to perform something with action and without instruction. For example, like pulling or pushing or even twisting a door knob.According to Norman (1988) an affordance is the design aspect of an object which suggest how the object should be used; a visual clue to its function and use.As a human been,we do thing by observe it and look what other people do and automatically it will send to our brain and we know how to do sentence thing. If the designer create a chair at first we don't really know what to do with the chair after we look what other people do so then we know how to use it and we also will automatically know and set it our brain the chair is for us to sit.For conclusion what I understand is affordance is the matter of knowing how to use it.(taken from http://www.interaction-design.org/encyclopedia/affordances.html) Norman writes:

"...the term affordance refers to the perceived and actual properties of the thing, primarily those fundamental properties that determine just how the thing could possibly be used. [...] Affordances provide strong clues to the operations of things. Plates are for pushing. Knobs are for turning. Slots are for inserting things into. Balls are for throwing or bouncing. When affordances are taken advantage of, the user knows what to do just by looking: no picture, label, or instruction needed." (Norman 1988, p.9)