A Strife of Interests: Tripartite Center-Periphery Analysis of Events in a Policy Network David Knoke University of Minnesota Dimitris Christopoulos MODUL University Mario Diani University of Trento ABSTRACT Almost four decades of theorizing and research on policy networks generated numerous insights into their structures and consequences. Recent methodological developments promise improved understanding of these important political institutions. We explicate and demonstrate how two methods – tripartite or three-mode network analysis and core/periphery analysis – can be used in combination to reveal fine-grained details in previously unanalyzed data on the U.S. national labor policy domain. The three modes are private interest organizations, government legislative and executive agencies, and a set of labor legislation events. In restricted tripartite analyses both types of organizations have interests in the events but not in one another. In unrestricted tripartite analyses, the two sets of organizations also communicate policy information. The results reveal that the labor policy domain is differentiated into a core position, occupied by generalist organizations and legislative events which attract wide interest, and a peripheral position occupied by specialist organizations and events of narrow interest. We conclude with some implications for policy network research and applications to a broader range of multimodal social networks.