Principle of least astonishment - Wikipedia, the free encyclopedia
The principle of least astonishment (POLA), sometimes also referred to as Principle of Least Surprise, applies to user interface and software design, from the ergonomics standpoint.[1] It is alternatively referred to as the law or rule of least astonishment, or of least surprise.[2][3] The principle can be stated as "if a necessary feature has a high astonishment factor, it may be necessary to redesign the feature."[4] In general engineering design contexts, the principle may be taken to mean that a component of a system should behave in a manner consistent with how users of that component are likely to expect it to behave.
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