Articles explaining the heuristic evaluation technique for assessing usability, from Nielsen Norman Group, a firm specializing in User Experience Research, Training, and Consulting.| Nielsen Norman Group
The book Usability Inspection Methods, edited by Jakob Nielsen and Robert L. Mack, is the first comprehensive, book-length work in the field of usability evaluation and includes a full complement of UI strategies, tools, and techniques.| Nielsen Norman Group
This article summarizes statistics for 13 usability laboratories. It also gives an introduction to the main uses of usability laboratories in usability engineering and surveys some of the issues related to practical use of user testing and computer-aided usability engineering.| Nielsen Norman Group
Jakob Nielsen's textbook on applying systematic methods throughout the development lifecycle to increase ease-of-use for software, websites, and other user interfaces. Emphasis on cheap and fast methods.| Nielsen Norman Group
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.| Nielsen Norman Group