Well here's a good read about a 11 year long project without any customer feedback and non-pivoting waterfall model in action: http://steveblank.com/2010/11/01

Well here's a good read about a 11 year long project without any customer feedback and non-pivoting waterfall model in action: http://steveblank.com/2010/11/01/no-business-plan-survives-first-contact-with-a-customer-%E2%80%93-the-5-2-billion-dollar-mistake/ http://steveblank.com/2010/11/01/no-business-plan-survives-f... Spoiler: They lost some money.