The lean startup movement talks about the same things that UX people have talked about for decades. The difference is that people are now listening. Lean UX is an approach that quickly followed the lean startup movement. It is not a new thing. It’s just a new name for things that were always around. The difference is in the packaging of these ideas.
This article takes the principles of the lean startup and suggests their UX research equivalents. Hopefully, it sheds some light on why the lean startup concept is so very well accepted in the entrepreneurial world and why startups suddenly want to do UX research and design.