10. As defined most succinctly by Usability.gov Usability “refers to how well users can learn and use a product [or a website] to achieve their goals and how satisfied they are with that process.”
27. Jakob Nielsen: The F-Shaped Pattern Not only do we know what users read, we know how they read it. Eyetracking studies show web users scan content in an F-pattern. Alertbox: F-Shaped Pattern Useit.com: Eyetracking Overview
31. Steve Krug on content: “ People are not going to read very much on your home page; they just want the gist in a short sentence or two.” Common sense web design
59. Usability pays off Source: Nielsen Norman Group, 2009 Metric Average Improvement Sales /Conversion 87% Traffic/Visitors 96% User Productivity 119% Use of Specific Features 223%