Johannes Thönes talks to Barry O'Reilly, principal consultant at ThoughtWorks, about his recently published book Lean Enterprise. A lean enterprise is a large organization that manages to keep innovating while keeping its existing products in the market. O'Reilly talks about the idea of scientific experiments and the build-measure-learn loop popularized by the lean-startup method. He shares his experiment of an online wine seller using Twitter. He further discusses the challenges for enterprises trying to do something similar and introduce the three-horizon model, to manage innovative, growing, and new products. As an example of a successful lean enterprise, O'Reilly talks about GOV.UK, the British government's new website.