MEDEA is primarily designed to compile data (and secure them over the mid- and long-term) on extreme meteorological events from various scientific disciplines. An overall picture of extreme events can only be gained if the full range of data – meteorological to socioeconomic data – is simultaneously available, and if the causal chains specified in StartClim.6 are supported by data throughout. At the next level, the explicit incorporation of data uncertainty would be a necessary step toward improved uncertainty and risk assessments in the analysis of extreme events. This will be an important and often demanded contribution to incorporating these issues in climate and climate impact research.