Usability testing, design reviews, usability training courses, and other UX consulting services to help improve the user experience of your interfaces.| Nielsen Norman Group
Computing the net present value (NPV) lets you estimate the most profitable level of usability investment. For big projects, expensive usability can pay off.| Nielsen Norman Group
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
3 methods for increasing UX quality by exploring and testing diverse design ideas work even better when you use them together.| Nielsen Norman Group
Testing ever-more users in card sorting has diminishing returns, but test at least 15 users -- 3 times more than you would in traditional usability tests.| 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
When collecting usability metrics, testing with 20 users typically offers a reasonably tight confidence interval.| Nielsen Norman Group