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UX Design for Mobile by Pau Giner, Pablo Perea

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Needs from general expectations

Even if our body and brain are capable of doing many activities, it does not mean all of them are convenient, comfortable, or pleasing for us. Regardless of the specific type of product, users have general expectations when using them. Failing to meet those expectations when designing our products will negatively affect the resulting user experience. Users will be confused to see a product not behaving as they expected, which is breaking the principle of least astonishment.

Each interaction the user performs with a product requires some mental effort. This mental effort is often referred as the cognitive load. For example, a navigation app can ask your destination during your vacation trip in different ways. ...

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