Party Politics and Pressure Groups: A Comparative Introduction

The book argues that parties and pressure groups must be studied together as interdependent forms, not in isolation. Its key contribution is a typology of their relationships: a party can be subordinate to a pressure group, a pressure group can be subordinate to a party, or they can cooperate on equal terms . It is a condensed and updated version of material from Duverger's Sociologie politique, designed as a comparative introduction [citation:8]. Reviewers noted it performs the same definitional and categorizing function for comparative politics as the earlier Political Parties did, while streamlining the older structural categories .

Duverger streamlined his classification system. He dropped the 'totalitarian party' category, though he retained the authoritarian party and the one-party system, which behavioralists had found more useful . He also cautioned against exaggerating the difference between two-party and multiparty systems, a contrast he had emphasized more strongly in 1951 . The basic distinction between mass and cadre parties — now called elitist or traditional parties — remained the foundational element of his organizational typology, even as the behavioral revolution in political science shifted attention from structure to function .

Duverger identifies three possible relationships. Some political parties may be subordinate to pressure groups; some pressure groups may be subordinate to political parties; and there can be cooperation on an equal basis between a party and a pressure group. The fundamental distinction is that parties aim to conquer power or participate in its exercise, while pressure groups do not seek power themselves but try to influence those who hold it. Parties rest on general solidarity; pressure groups rest on particular solidarities [citation:9].

Behavioralists criticized Duverger for providing only sterile organizational distinctions. They argued that structural categories were unimportant because two organizationally different parties could perform the same function in a system, while two similar parties could perform different functions. If a party of militants could have different roles in different cultural settings — Britain and Ghana, for example — what analytic function did structural categorization serve? The behavioralists preferred to concentrate on function, culture, and similar concerns, ignoring organizational variables . Yet Duverger was not ignored: his categorizations remained indispensable for comparative research .

The book is an extract from Duverger's Sociologie politique, first published separately as Les partis politiques et les groupes de pression and translated into English in 1972 [citation:8]. At 168 pages, it is a condensed comparative introduction designed to make Duverger's framework accessible [citation:5]. Reviewers welcomed it on its own merits for three reasons: it updated the 1951 categories in light of the behavioral revolution, addressed political developments like de Gaulle's France and modern Germany, and provided a more streamlined classification system . It performs the same introductory function for a new generation of students that the earlier work had done.

A common misconception treats pressure groups as secondary or peripheral to party politics. Duverger's framework places them at the center of the analysis, alongside parties, as the two fundamental organizational forms of modern politics. His comparative introduction gives equal weight to both, examining the general theory of pressure groups, the different kinds of pressure groups — professional organizations and others — and their interaction with parties [citation:5]. The book's title itself signals this parity: it is not a study of parties with a chapter on pressure groups appended, but an integrated analysis of both.