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Discusses usability heuristics i.e. principals used with UX design
Jakob Nielsen • Usability 101: Introduction to Usability

how design has become mass user-centered, driven by rules of optimization, efficiency and engineering.
Thomas Klaffke • Visualizing Minimalist Design
Every extra unit of information in an interface competes with the relevant units of information and diminishes their relative visibility.
Jakob Nielsen • 10 Usability Heuristics for User Interface Design
In all the time I’ve spent watching people use the Web, the thing that has struck me most is the difference between how we think people use Web sites and how they actually use them. When we’re creating sites, we act as though people are going to pore over each page, reading all of our carefully crafted text, figuring out how we’ve organized things,
... See moreSteve Krug • Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability (Voices That Matter)
People do not go to a website to admire it, but to get something done.
Jakob Nielsen
Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability (Voices That Matter)
amazon.com
It is also possible to collect more specific metrics, such as the percentage of time that users follow an optimal navigation path or the number of times they need to backtrack.
Jakob Nielsen • Usability Metrics
Billboard Design 101 DESIGNING FOR SCANNING, NOT READING