Recently, a friend sent me a message about a website I run, suggesting that I add classifieds to the site. After thinking about it, I realized the integration of classifieds could be beneficial for myself and my users. Yet I had never considered it before! My site had no place to submit feedback and who knows what other great ideas I’ve missed from other people.
http://www.uxbooth.com/articles/increasing-usability-with-user-feedback/
You have created a functional prototype. You’re proud of it and believe that it is perfectly designed to solve your particular market problem. It’s elegant, beautiful, tight. You’ve convinced yourself that no one, not even the drunkest of users, would have difficulty using it.
https://community.uservoice.com/blog/usability-testing-best-practices/