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This article complements Wlezien’s review of ‘conceptualisation, measurement and interpretation in representational research’ by considering how these operate within five predictive theories validated against comparative evidence, as recommended for cumulative research by Taagepera: and related to their wider institutional and methodological context by Budge. Methodologically, the article illustrates how predictive theories can be set up to explain political processes and validated against statistical evidence. Substantively, the theories both highlight and resolve the ‘Paradox of democracy’ – how can ideologically based political parties effectively match public policy to popular preferences with only weak guidance from citizens? [ABSTRACT FROM AUTHOR]