The nature and effectiveness of any international legal agreement is heavily shaped by the forum in which it is negotiated and implemented. This includes both the substantive content that global policymakers agree upon and the subsequent state compliance with those provisions. Forums differ in their institutional characteristics, thereby providing unique opportunities and costs for participating actors. Forums may have different mandates, capacities, cultures, members, and legal processes — all of which ultimately affect distributions of power and influence. These differences then shape how issues are framed, the content of agreements as they are negotiated, and the incentives states have to comply with any obligations.