This document discusses the Lean Startup methodology. It notes that the vast majority of new products and startups fail. The Lean Startup approach was developed by Eric Ries to help startups search for a scalable and profitable business model through experimentation and customer feedback. It advocates developing a minimum viable product and using the build-measure-learn process to continually pivot based on learning. The Lean Startup principles of validating learning and innovation accounting are also summarized.