There is a large empirically-based literature within behavioural economics and environmental  psychology identifying critical challenges that individuals acting in both lay and professional capacties-have with evaluating and prioritizing actions across multiple types of risk. Such difficulties at the cogntive level  likely affect both citizen and institutional responses. In the case of citizens, these difficulties can affect  whether they respond appropriately to early warnings, and other calls for individual risk mitigation actions. In  the case of professionals, the difficulties can influence whether they will choose to apply formal decision- analytic methods. The first part of this task will be to map findings from these literature onto the challenge  of multi-hazard decision-making. The second will then be to design and conduct an economic experiment to be  conducted in the decision-making laboratory, to quantify and validate these findings.