Tim Meyer is an Associate Professor of Law at the University of Georgia School of Law.] For the last several decades, the central problem in much institutionalist scholarship has been how to design what I refer to as credible commitment regimes. Such regimes establish, or create fora in which states can later establish, substantive rules of conduct to coordinate state behavior across an increasingly wide range of issues. On the assumption that rational, self-interested states will cheat on these conduct rules if it is in their interest to do so, credible commitment regimes also create enforcement mechanisms to alter state incentives. Monitoring, verification, and dispute resolution mechanisms publicize violations, authorize retaliation, and in some instances award monetary damages. For example, the WTO agreements establish rules on the kinds of limits states may place on international trade. The WTO also creates the Dispute Settlement Body, which serves as a vehicle to further clarify the content of those rules, publicize violations, and reduce the cost of retaliation by defining when it is legally permissible. Below the radar, however, a class of international agreements have emerged that seek to coordinate state behavior through the production and regulation of information, rather than the creation of credible commitments. Following a robust literature on epistemic communities, I refer to these international regimes as epistemic institutions or epistemic agreements, and the phenomenon as epistemic cooperation. In its purest form, epistemic cooperation does not legally require states to take action on the regulated issue. Instead, it merely requires them to produce and share information with each other. The aim is to encourage states to coordinate their activities based on this information, rather than based on a legal rule made credible through international institutions. Examples of epistemic institutions that work in this way abound.