Nudging is a form of social engineering — a way of designing system constraints and support structures to encourage the majority of people to behave in accordance with your plan. Here’s a famous-in-my-classroom example of nudging: Opt-in versus Opt-out Consent Solutions There are many examples of such social engineering. During our breakout groups at the NIH think tank on the future of citizen participation in biomedical research, I raised the difference between opt-in versus opt-out option results for organ donation. In some countries in Europe, citizens have to opt-out from donating their organs in a case of a tragic accident — they have to do something to NOT donate their organs. As the result in Austria — which has an opt-out system — the donation rate is 99.98%! While in Germany — which has an opt-in system — only 12% will their organs for transplants. This is a huge difference in consent between very similar populations of people. Unintended Consequences of Social Design Not all social engineering efforts go as well as opt-in/opt-out organ donation systems. To reduce pollution for the 2008 Summer Olympic Games in Beijing, the Chinese government established the even/odd license plate law: cars with even license…