What is good scientific expertise for decision-making? Relevance matters

This article aims to clarify the conditions under which communication between scientific experts and decision-makers succeeds – or fails – by emphasising the importance of the relevance of the information provided in relation to the questions decision-makers are asking. It focuses in particular on the courtroom setting, which offers a close-up view of the crucial role played by the relevance of the questions addressed to experts and the answers they provide.