Never ask your mother whether your business plan is a good idea. Even more: ask nobody! That is what tech-entrepreneur Rob Fitzpatrick pleads for in the book The Mom Test. 

According to him people in business lie to each other all the time, because it is not in their interest to tell the truth. But how then do you test a new idea with your clients?How you do find out what your clients really need, is a fundamental skill for everybody that is engaged in product development, business development or Lean Startup. Using fundamental data The Mom Test offers many recognizable examples and tips to improve client communication.