The Populism and Political Parties Expert Survey, abbreviated as POPPA, is an expert survey measuring party positions and attitudes on key attributes related to party characteristics related to populism, party attitudes toward political representation, party ideology, and party organisation.

The principal motivation for the expert survey is to provide a better understanding of key party characteristics related to populism and political representation. Rather than imposing one specific definition of populism and specifying which parties are to be classified as populist, the Populism and Political Parties Expert Survey (POPPA) aims to measure the relevant constitutive dimensions underlying dominant conceptualisations of populism for all political parties in each party system.

The expert survey was fielded in Spring 2018 covering all relevant political parties in 28 European countries. The full data set will be made publicly available through this website.