Contributor(s): Professor Nick Chater, Professor Liam Delaney, Professor Paul Dolan, Professor Ulrike Hahn, Dr Grace Lordan | The impacts of COVID-19 and how we deal with them hinge on how politicians, firms and the public respond. What lessons can we learn from behavioural science about how we act in a time of crisis characterised by great uncertainty? What lessons can behavioural science learn about how it can be best placed to provide guidance in an uncertain world? Answers to these questions are crucial to not only mitigating the impacts of COVID-19 but also to dealing better with future crises, not only caused by viruses but also by other shocks. Nick Chater (@NickJChater) is Professor of Behavioural Science, University of Warwick. He is on the advisory board to the Behavioural Insights Team. Liam Delaney (@LiamDelaneyEcon) is Professor of Behavioural Science at University College Dublin and has been advising the Irish Government on its response to COVID-19. He will be joining LSE