We’ve been working on nudges, randomized controlled trials and systematic reviews for years. Now, with big data, we’re proposing experimentation. This is what governments in the developed economies are doing. Perhaps even more than new ideas, the behavioral group is bringing a new approach to government. Experimentation is the key: Different nudges are tried systematically, results are quantified and, even after the best approach is selected, the team goes back to see how things are working.