This paper challenges some widespread theoretical assumptions and practices in the study of populism and proposes a new multidimensional approach to generate and analyse data on this latent construct. Rather than focusing on categorising subjects as populists or not, it recommends reaching a better understanding of what populism is, the salience and relative weight of its attributes and how they interact creating an inner populist logic. Despite the increasing media and academic attention, historical discrepancies in how to conceptualise and operationalise populism have hindered cumulative progress in the literature. Initially most efforts were devoted to the study of specific movements, without a clear comparative angle, and the concept of...