Most accidents are attributed to human error, but in almost all cases the human error was the direct result of poor design. This chapter introduces about the principles of design such as affordances, feedback and visibility. The fundamental principles of designing for people are to provide a good conceptual model and to make things visible. A good conceptual model allows us to predict the effects of our actions.
The right things have to be visible in design to indicate what parts operate and how, to indicate how the user is to interact with the device. Visibility indicates the mapping between intended actions and actual operations. Visibility indicates crucial distinctions so that you can tell salt and pepper shakers apart, for example.
How do people cope with studying so much visual perception. Part of the answer lies in the way of mind works, in the psychology of human thought and cognition.
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