By rifanmuazin 
The rise of populism across the European continent has fundamentally altered the landscape of modern governance. From the fringes of parliamentary debate to the corridors of executive power, populist parties are increasingly shaping policy, public discourse, and the future of the European Union. However, identifying exactly which parties qualify as "populist" remains a point of intense academic and political contention. To move beyond subjective characterizations, researchers have developed rigorous, data-driven frameworks to classify political entities based on their ideological stances, their relationship with institutional elites, and their core rhetoric.
This report outlines the methodology employed to standardize the definition of populism in contemporary European politics, drawing on the latest available datasets to ensure a comprehensive, non-partisan, and scientifically sound categorization of political movements.
Main Facts: The Multi-Methodological Approach
Defining populism is notoriously difficult because it is not a singular, monolithic ideology like liberalism or conservatism; rather, it is a "thin-centered" ideology that pits "the pure people" against "the corrupt elite." To capture this nuance, we utilize a tri-partite consensus model. A political party is classified as populist if—and only if—it is designated as such by at least two of the three premier industry benchmarks: the 2024 Chapel Hill Expert Survey (CHES), the 2023 Populism and Political Parties Expert Survey (POPPA), and The PopuList 3.0.
By requiring a multi-source validation, we mitigate the risk of individual bias and ensure that the "populist" label is reserved for parties that demonstrate clear, empirically verifiable anti-establishment characteristics. This consensus-based approach allows for a more stable and comparative analysis across the complex ideological spectrum of the European Union, Iceland, Norway, Switzerland, Turkey, and the United Kingdom.
Chronology of Data Collection and Research
The precision of this study relies on the recent, exhaustive efforts of hundreds of political scientists. The timeline of this data collection reflects the rapid evolution of the European political climate:
- Early 2023 (POPPA): Between January and May 2023, the Populism and Political Parties Expert Survey (POPPA) mobilized 324 political science experts to evaluate 312 parties across 31 countries. This survey focused specifically on indicators of political representation and populist rhetoric.
- Late 2023 (The PopuList): Building on years of iterative, collaborative research, the 2023 release of The PopuList 3.0 provided a historical baseline, classifying parties that have achieved parliamentary representation (2% threshold or seat-winning) since 1989.
- Late 2024 (CHES): The most recent data comes from the 2024 Chapel Hill Expert Survey. Conducted between October and December 2024, this massive effort involved 609 experts evaluating 279 parties. This dataset serves as the backbone for both ideological positioning and anti-elitism metrics.
Supporting Data: Quantifying Anti-Elitism and Ideology
To move from abstract theory to actionable data, we rely on two primary metrics derived from the CHES and POPPA datasets:
Measuring Anti-Elitism
Within the CHES dataset, anti-elitism is quantified through an average of two critical variables. The first, "PEOPLE_VS_ELITE," measures a party’s stance on democratic governance. A score of 0 indicates a preference for representative, institutionalized decision-making, while a 10 signifies an advocacy for direct, anti-establishment power where "the people" override politicians. The second variable, "ANTIELITE_SALIENCE," measures how central anti-establishment rhetoric is to the party’s platform. By averaging these two scores, we establish a robust "anti-elitism" index. Parties scoring 7.0 or higher on this scale are categorized as populist.
Defining the Ideological Spectrum
Beyond populism, understanding whether a party leans left, right, or center is vital for contextualizing their influence. We utilize the "LRGEN" variable from CHES and the "LROVERALL" variable from POPPA to map these positions.
- Left-Wing Parties: Scored below 4.5.
- Centrist Parties: Scored between 4.5 and 5.5.
- Right-Wing Parties: Scored above 5.5.
The reliability of these classifications is underscored by the high degree of inter-dataset correlation. When comparing the ideology rankings of parties identified as populist, the POPPA and CHES datasets showed 100% agreement, providing a high degree of confidence in the ideological mapping of Europe’s political landscape.
Official Responses and Academic Oversight
The methodology described herein is not designed in a vacuum. It is the result of a rigorous peer-review culture inherent in political science. Official responses from the teams behind CHES, POPPA, and The PopuList emphasize the importance of iterative refinement.
Experts contributing to these datasets are selected for their granular knowledge of specific national political systems. By using a collaborative, comparative expert model—where local experts and international observers cross-verify each other’s findings—the potential for "home-country bias" is drastically reduced. These institutions have confirmed that their data, while frequently used for academic publication, is intended to provide a stable, longitudinal tool for journalists, policymakers, and civil society organizations to track the democratic health of European nations.
Implications for European Governance
The implications of this classification are profound. By clearly delineating populist parties from their traditional counterparts, we can observe distinct patterns in how these parties interact with international institutions, immigration policies, and fiscal frameworks.
The Normalization of Populism
The fact that populist parties now operate on both the far-left and the far-right underscores the "thin" nature of the ideology. It is no longer an outlier; it is a permanent fixture. As these parties gain, lose, or hold onto parliamentary seats, the ability to accurately categorize them allows for better predictive modeling of legislative gridlock or coalition-building potential.
Impact on Democratic Institutions
The use of the "PEOPLE_VS_ELITE" metric is particularly significant. It tracks a growing sentiment in Europe that representative democracy is insufficient or corrupt. When a significant portion of a country’s political spectrum scores high on this metric, it signals an impending challenge to the established order—often manifesting in calls for constitutional reform, referenda, or the dismantling of judicial oversight mechanisms.
Future-Proofing Political Analysis
This framework provides a template for future research. As Europe approaches new election cycles, the stability of these metrics—specifically the 7.0 threshold for populist classification—will allow for year-over-year comparisons. Are populist parties becoming more or less radical? Are they moving toward the center or further toward the ideological fringes? By relying on the consensus of hundreds of experts rather than the rhetoric of a few pundits, we gain a clearer, more objective picture of the shifting tides of European democracy.
In conclusion, while the labels "populist," "left," and "right" are often used loosely in public discourse, the methodological rigor applied here provides a necessary corrective. By grounding our analysis in the 2024 CHES data, the 2023 POPPA survey, and The PopuList, we ensure that our understanding of the European political landscape is built on a foundation of empirical evidence, expert consensus, and transparent criteria. This systematic approach is the only way to navigate the complexities of modern European politics with the accuracy and depth that the current era demands.
Neng Nana 
Sagoh 
Asep Darmawan 