Jakob Nielsen, Ph.D., is a User Advocate and principal of the Nielsen Norman Group which he co-founded with Dr. Donald A. Norman (former VP of research at Apple Computer). Dr. Nielsen established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and has invented several usability methods, including heuristic evaluation. He holds 79 United States patents, mainly on ways of making the Internet easier to use. Read more about Jakob.
Game testing researches the notion of fun. Compared with mainstream UX studies, it involves many more users and relies more on biometrics and custom software. The most striking findings from the Games User Research Summit were the drastic age and gender differences in motivation research.
Browser tabs separate the stages of collection and comparing and serve as memory aids to keep many alternate pages available for consideration as users are shopping or researching. 7 UX guidelines support this user behavior, which is particularly common among younger users.