the design of evertday things


> [Untitled](https://www.amazon.com/Design-Everyday-Things-Revised-Expanded/dp/0465050654)

1. Visibility - function should be visible
2. Feedback - feedback to user should be
3. Affordance - User will be recognize Intentions
4. Mapping - User can map behavior to design
5. Constranint - Design constraint user behavior
6. Consistency - design has pattern and rule
