Since January 2020, governments have engaged in exceptional decision-making to limit the propagation of the Covid-19. Although initially strong, public support for emergency measures has eroded as the severity of the pandemic has lessened. Throughout Europe, citizens and scholars are increasingly critical about the democratic and human right costs of the management of the pandemic. Moreover, exceptional measures can durably affect democratic governance. If unaddressed, this decrease in public trust can reduce citizens compliance with public health measures and destabilize democratic stability. This calls for urgent research on the modalities, impacts and determinants of emergency decisions in crisis times. To meet this need, EXCEPTIUS analyses exceptional decision-making in 32 European countries. The project contributes interdisciplinary knowledge to the study of democratic resilience, by assessing why some democratic systems prove more resilient to crises and which political reforms increase such resilience.