The Group of Thirty (G30) commenced a 17-jurisdiction review of financial regulatory approaches in July 2007, prior to the current market turmoil that has impacted many countries around the globe.1 We began the project at a time when the efficiency and efficacy of financial regulation and supervision were being actively discussed and debated. Today, those issues are even more salient and important for national and international financial supervisors and policymakers as they seek to restore financial stability. This report is being published during a period of extensive global focus on the benefits and challenges of various supervisory approaches. We hope it will contribute to the international dialogue on the key matter of supervisory architecture.