Book excerpt: Liberalism, conservatism, populism, environmentalism, multiculturalism, agrarianism, labour pragmatism, socialism, and myriad other isms. Ideology is a ubiquitous, continuously innovating dimension of human experience, but its character and impact are notoriously difficult to pinpoint within political and social life. Political Ideology in Parties, Policy, and Civil Society demonstrates that the reach and significance of political ideology is best understood through a multidisciplinary approach. Contributors to this volume explore a broad territory from multiple perspectives: the influence of English country party ideology on late-eighteenth-century American political thought; multiculturalism, populism, and environmentalism in Canada; the ideological underpinnings of Canadian development assistance policy; contemporary efforts to shape working-class and farmer ideologies in western Canada; and the interweaving of academic theory and ideology in game theory. This stimulating volume offers empirical interpretations that break new ground, and demonstrates the strength of interdisciplinary approaches to the study of political ideology.