Norms are one of the most widely studied topics of contemporary International Relations scholarship. Norms scholars have created an extensive theoretical and empirical literature to identify, describe, and analyze the emergence, diffusion, and effect of norms in the international system. However, this scholarship is inconsistent in how it treats state choice and norm diffusion; in particular, it is divided between theories that emphasize continuity and those that allow for change in the process of norm adoption and implementation. This article suggests that the problem can be remedied through a closer examination of the structure of norms themselves. It first shows that the prevailing understanding of contemporary international norms is that they have a tripartite structure, consisting of a problem, a value, and a behavior. These structural components can be combined to create norms as traditionally understood. The article also proposes a new concept — a “norm cluster” — which allows for multiple combinations of conceptually interlinked but distinct values and behaviors, offering multiple acceptable solutions to similar and interlocking problems. The actors that adopt a norm cluster, rather than a single norm or set of norms, may be recognized as a family group: although no cluster adopter need perfectly re-enact the choices of others, the resulting variation in outcomes is accepted as “close enough.” The article argues that focusing on norm components and clusters, rather than on single norms as currently understood, allows for a more precise understanding of how principle-based action diffuses and evolves in the international system.
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