"On the Web, usability is a necessary condition for survival. If a website is difficult to use, people leave. If the homepage fails to clearly state what a company offers and what users can do on the site, people leave. If users get lost on a website, they leave. If a website's information is hard to read or doesn't answer users' key questions, they leave. Note a pattern here?"

Source : "Usability 101: Introduction to Usability" by Jakob Nielsen, www.nngroup.com. January 4, 2012.

Jakob Nielsen

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