The application of behavioural science to address policy problems has expanded greatly in recent years. You can read an international review here.
In part, this expansion is happening because behavioural science offers ideas for how policy can change behaviour and help people to make better decisions. But it also reflects the benefit of using experiments.
Most of our work involves experiments. These may be undertaken on computers, in the lab or online. For some policy problems, we conduct field experiments, in which we test whether an intervention will work using a randomised controlled trial (RCT) or similar method.
We also publish some international reviews of behavioural research to help policymakers understand the implications of behavioural science. An example is here.