ONE: OVERVIEW
1. A good design should make atrade-off among follow aspects:
a) Provide a good conceptualmodel, so users can know how the system operate, having a nice system image.
b) Make things visible, so userscan pay attention to the exactly point.
c) Use natural mapping, so userscan map the control and the operation with no effort..
d) Give feedback, so users cancatch the state of the system and if their operation work.
TWO: The psychology of everyday actions
1......
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