Better to accept a wider margin of error in usability metrics than to spend the entire budget learning too few things with extreme precision.| Nielsen Norman Group
How users react to delays in a user interface, whether website or application. The 3 main response time limits are determined by human perceptual abilities.| Nielsen Norman Group
Slow page rendering today is typically caused by server delays or overly fancy page widgets, not by big images. Users still hate slow sites and don't hesitate telling us.| Nielsen Norman Group
Elaborate usability tests are a waste of resources. The best results come from testing no more than 5 users and running as many small tests as you can afford.| Nielsen Norman Group
Users ages 65 and older face unique challenges when using websites and apps. Digital literacy among this demographic is rising, but designs need to accommodate older users.| Nielsen Norman Group
When collecting usability metrics, testing with 20 users typically offers a reasonably tight confidence interval.| Nielsen Norman Group
The answer is 5, except when it's not. Most arguments for using more test participants are wrong, but some tests should be bigger and some smaller.| Nielsen Norman Group
Research spanning 20 years proves PDFs are problematic for online reading. Yet they’re still prevalent and users continue to get lost in them. They’re unpleasant to read and navigate and remain unfit for digital-content display.| Nielsen Norman Group