affordance-Li Chean

Affordance(definition): properties or quality of an object that allow individual to use/act on them - J.J Gibson

Properties of affordance:

-it will not change,for the needs or goals of individual

-It depends on ability of individual on how suitable for them to use.

-it exist due to capabilities action of particular individual (example-OKU)  

having a good affordance:

-users can directly knowing it without thinking and testing too much or by looking signs and label to do actions.

Perceive affordance:

-by Donald Norman

-refer to the properties of people how could people use it 

-interested in what user perceives than what actually truth.

Elements of perceived affordance :
-culture 

-context
-instinct
-mental model

Forcing functions: 

- Lock-in

- Lock-out

-Interlock

Summary:

- persuasive-design are needed,even it involve in money making. 

- Profitable to the client = profitable to user