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While much progress has been made in empirically mapping and analysing a variety of interest group activities in the last decade, less attention has been devoted to conceptual work that clearly defines and distinguishes different forms of policy engagement. This article contributes to this endeavour by developing a theoretical framework that explicitly links currently available measures of the policy engagement of groups to the distinct concepts of group involvement, access and prominence. It argues that greater conceptual clarity will lead to better accumulation of knowledge in the sub‐field and a better understanding of the role of interest groups in political systems.