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User expectations refers to the consistency that users expect from products. Interaction design is very concerned with this topic.

A good rule of thumb or design principle to use in interaction design is to follow the "Principle of least astonishment".

In the case of interactive software applications, for example, users form expectations based on their experience with similar kinds of software. Effective software design aims to conform with prevailing norms for aspects of behavior such as the software's user interface and its respons

http://en.wikipedia.org/wiki/User_expectations

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