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About: All technology is dual use to some degree: it has both civilian and military applications. This foundational feature often makes it hard to limit military competition. In a recent International Organization article, Jane Vaynman and Tristan Volpe reveal why this is the case. They argue that the duality of technology matters because it shapes the tension between detection and disclosure at the heart of arms control: agreements must provide enough information to detect violations, but not so much that they disclose deeper security vulnerabilities. They characterize technology along two dual use dimensions: (1) the ease of distinguishing military from civilian uses; (2) the degree of integration within military enterprises and the civilian economy. As these attributes vary, so do prospects for cooperation. The study introduces a new data set to assess both variables and their impact on competition across all modern armament technologies.