The Group of Twenty industrialized and emerging market economies (G-20) has broken new ground over the past year or two. It has embraced the type of collaborative approach to policy design and review that is well suited to today’s interdependent world, where policies in one country can often have far-reaching effects on others. In this spirit, the backbone of the G-20’s “Framework for Strong, Sustainable, and Balanced Growth” is a multilateral process that includes a ‘mutual assessment’ of their progress toward meeting shared objectives. But, what exactly will this G-20 Mutual Assessment Process—or “MAP”—imply in terms of prospective actions? And what have we learned so far?