How Many Participants for Quantitative Usability Studies: A Summary of Sample-Size Recommendations
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40 participants is an appropriate number for most quantitative studies, but there are cases where you can recruit fewer users.

3 Fast Tests That Cost You Nothing
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usability testing is not your only option. If I am honest, I am doing less and less usability testing, but instead focusing more on lightweight testing that can be done often and brings more value in getting projects out of the door.

Why 5 Participants Are Okay in a Qualitative Study, but Not in a Quantitative One
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Qualitative usability testing aims to identify issues in an interface, while quantitative usability testing is meant to provide metrics that capture the behavior of your whole user population.

Maintain Consistency and Adhere to Standards (Usability Heuristic #4)
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Users should not have to wonder whether different words, situations, or actions mean the same thing. Follow platform and industry conventions.

10 Usability Heuristics for User Interface Design
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Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.

Refrain from Opening Links in New Browser Windows and Tabs
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Refrain from opening new browser windows. [...] Carefully examine the user’s context, task at hand, and next steps when deciding whether to open links to documents and external sites in the same or a new browser tab."

Photos as Web Content
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Users pay close attention to photos and other images that contain relevant information but ignore fluffy pictures used to "jazz up" web pages.

SpaceX: Simple, beautiful [ed. beautifully to use] interfaces are the future
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An interface to control a spacecraft - how complex and complicated does it have to be?

Hick's law and user experience - the more choice, the longer to make a decision
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Choice seems appealing. But choice overload means we need longer to make decisions. Too long and people will abandon the task and look elsewhere.

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