Jørgen Møller is professor of political science at Aarhus University. His research interests include the conceptualization, measurement, and explanation of modern states and political regimes. Svend-Erik Skaaning is professor of political science at Aarhus University and co-principal investigator of the Varieties of Democracy project. His research interests include the conceptualization, measurement, and explanation of modern states and political regimes. Their recent books include Democracy and Democratization in Comparative Perspective: Conceptions, Conjunctures, Causes, and Consequences (2013)