usability heuristics

https://www.dropbox.com/s/izat4doi3efzqhp/10-usability-heuristics-11x17-print.pdf?dl=0

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http://www.nngroup.com/articles/text-over-images/

http://www.nngroup.com/articles/navigation-you-are-here/

http://www.nngroup.com/articles/flat-design/

http://www.nngroup.com/articles/characteristics-minimalism/

http://www.nngroup.com/articles/password-creation/