Eric Ries developed the lean startup methodology, emphasising rapid experimentation and validated learning over traditional business planning. The Lean Startup outlines iterative product development where businesses test assumptions, gather feedback, and pivot based on evidence rather than lengthy upfront planning. The Startup Way extends these principles to larger organisations seeking startup agility and innovation. The Leader's Guide applies lean thinking to leadership. Ries's works appeal to entrepreneurs, product managers, and organisational leaders navigating uncertainty, challenging conventional planning with empirical methods focused on reducing wasted effort.