The document discusses the concept of product/market fit and how it is essential for startup success. It describes how startups must find a widespread set of customers that resonate with their product. It also discusses how the market can pull successful products out of startups in a great market with potential customers. The document then discusses how the Five Whys technique can be used to make incremental investments to evolve a startup's processes gradually by tying investments directly to preventing the most problematic symptoms and discovering the root causes of problems. An example is provided of how Five Whys was used to develop a member training system at SkyNet Stanford by addressing problems and making proportional investments at each level of the hierarchy.