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Replication of simple and transparent experiments should promote the cumulation of knowledge. Yet, randomization alone does not guarantee simple analysis, transparent reporting, or third-party replication. This article surveys several challenges to cumulative learning from experiments and discusses emerging research practices—including several kinds of prespecification, two forms of replication, and a new model for coordinated experimental research—that may partially overcome the obstacles. I reflect on both the strengths and limitations of these new approaches to doing social science research.
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