• Durability of Usability Guidelines About 90% of usability guidelines from 1986 are still valid, though several guidelines are less important because they relate to design elements that are rarely used today. The 944 guidelines related to military command and control systems built in the 1970s and early 1980s; most used mainframe technology. You might think that these old findings would be completely irrelevant to today's user interface designers. 60 guidelines reviewed here
  • Jakob Nielsen page Dr. Nielsen founded the "discount usability engineering" movement for fast and cheap improvements of user interfaces and has invented several usability methods, including heuristic evaluation. He holds 76 United States patents, mainly on ways of making the Internet easier to use.

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