When you're gone would you rather have your gravestone say, 'He never missed a meeting.' Or one that said, 'He was a great father.'
Steve BlankUsing the Product Development Waterfall diagram for Customer Development activities is like using a clock to tell the temperature. They both measure something, but not the thing you wanted.
Steve BlankUnless you have tested the assumptions in your business model first, outside the building, your business plan is just creative writing.
Steve Blank