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The concept of duality speaks to the core of the relational approach in the social sciences, which understands that essences imply relations. As a general concept, duality vastly enlarges the types of data and the types of phenomena network analysis can examine. Substantively, duality proves fundamental for the analysis of how the social is structured and how sociologists can go about analyzing such structuring. One of Georg Simmel’s (1955) fundamental insights into social structure was to see the intersection of circles, 1 that is, to understand a group as the union of individuals who belong to it and, in turn, to understand an individual as an intersection of the groups to which the individual belongs (p. 141). In Simmel’s understanding, individuals and groups are of the same contents, but two different categories.