This document discusses lean startups and key ideas from thought leaders in the field. It introduces Alfred Sloan and William Durant, founders of modern corporations like GM. It contrasts waterfall and agile development models and highlights the work of Steve Blank and Eric Ries. Blank's big idea was that startups fail because no one wants their products, so companies should "get out of the building." Ries introduced the concept of a structured approach using customer development and agile principles in a build-measure-learn loop. His key ideas were to minimize time in the learning loop and measure success through validated learning rather than time or money spent. The foundation of lean startups is to avoid building things no one wants and get through the