People often overlook new visual details added to an existing image. This affects the usability of many design elements, from error messages to navigation.
Events triggered via hover or click require distinct timing to avoid accidental activations and ensure that the user feels in control of the interface.
Moving elements are a powerful tool to attract users’ attention. When designing an animation consider its goal, its frequency of occurrence, and its mechanics.
Designing for all screen sizes must consider the human–device communication capacity, which depends on users’ memory, device portability, and screen size.
Users might overlook things that change too fast — and even when they do notice, changeable screen elements are harder to understand in a limited timeframe.
Users often leave Web pages in 10–20 seconds, but pages with a clear value proposition can hold people's attention for much longer. To gain several minutes of user attention, you must clearly communicate your value proposition within 10 seconds.
People remember much more after reading if they retrieve information about the text from memory. Quizzes are one way websites can help users remember more.
The human brain is not optimized for the abstract thinking and data memorization that websites often demand. Many usability guidelines are dictated by cognitive limitations.
Usability suffers when users type in passwords and the only feedback they get is a row of bullets. Typically, masking passwords doesn't even increase security, but it does cost you business due to login failures.
Although its individual features weren't new, the Mac offered integration, the expectation of a GUI, and interface consistency. Is the iPhone the Mac of mobile?