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Conclusions
UI design can be organized around some basic criteria such as eliminating possible distractions in the UI, providing feedback to the user, avoiding errors or making them easy to handle, or to recover them (to promote an exploratory interaction mode with the user interface), and so on.
In user interface design an important role is played by the underlying conceptual model. Generally speaking, people act by means of conceptual, meaningful representations of reality. Such representations are given by their current and past experiences. Hence, there are different mental models of the same application, as seen by those that design it, those that implement it and those that will use it. It is important for designers to be aware of the different mental representations involved in the creation and consequent use of a user interface.
These and the other principles we mentioned are the basis of user satisfaction, low error rates, and effective task performance that inspired UI design guidelines and standards.
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