One strong theme in the new US government’s United States Strategy to Anticipate, Prevent, and Respond to Atrocities is the importance of evaluation, learning, and adaptation. These elements of the strategy reflect the same basic tenets that motivated the Simon-Skjodt Center to conduct the project, “Lessons Learned in Preventing and Responding to Mass Atrocities”—namely, that atrocity prevention efforts should be informed by what has been learned about how to accomplish this goal, and that continued learning is crucial to help address gaps in our current knowledge.