This is Design Thinking at its best!
If you must read one thing, read this article. You cannot go wrong. While I read this, it reminded me the lesson that design schools teach about empathy, definition, ideation, prototyping, and testing. In each case, particularly with prototyping and testing. you need to zip your lips and listen.
And change if you must
http://dschool.stanford.edu/redesigningtheater/files/2012/08/design-thinking2.jpg