One of the central issues in the international climate change negations is the measurement, reporting and verification (MRV) of countries’ actions. This brief examines reporting and review practices in other major multilateral regimes and, drawing on these examples, outlines the essential elements of an enhanced system of MRV under the United Nations Framework Convention on Climate Change (UNFCCC). To move the climate MRV system closer to the norms set by other multilateral regimes, the next stage in its evolution should entail significantly strengthening the existing system of reporting and expert review, and establishing an additional layer of peer review.