This document discusses the lean startup theory and methodology. It introduces Rémy Blättler, the chief of system at Supertext AG, and his background. It then outlines the lean startup process of having an idea, building a minimum viable product, measuring how customers respond, and learning and iterating based on data. Examples are provided of how Supertext applied this approach in reality compared to their initial plans. The key lessons promoted are to start building something instead of waiting for the perfect idea, that no one will steal your idea so don't worry about sharing it, and to try selling the product before fully building it out.