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Parties are a key actor of modern political regimes, and can be defined on the basis of very different factors as ideology, organization, electoral mobilization, social representation, elite composition.
Our matrix focuses on the relationship between two analytical dimensions. The first concerns the origins of political parties, which can be located within the legislature, with parties being formed by groups of MPs, or outside Parliament, through the mobilization of societal cleavages. The second reflects parties' organization, on a continuum from a cohesive and hierarchical body to a loose network of individual actors.