In this interview with Maurits Meijers, we discuss the result of an expert survey that covers 250 political parties across 28 European countries. They do not simply ask if a party is populist, but how populist it is. Moreover, other dimensions of these parties are considered: their ideological position, their use of emotional tones, and much more. The data are available for downloading at Harvard Dataverse and you can play with the interactive tool to have a better grasp of the characteristics that come with populism.