The world is becoming increasingly global. This raises important challenges for regulatory processes which still largely emanate from domestic jurisdictions. In order to eliminate unnecessary regulatory divergences and to address the global challenges pertaining to systemic risks, the environment, and human health and safety, governments increasingly seek to better articulate regulations across borders and to ensure greater enforcement of rules. But, surprisingly, the gains that can be achieved through greater co-ordination of rules and their application across jurisdictions remain largely under-analysed. This volume complements the stocktaking report on International Regulatory Co-operation: Rules for a Global World by providing evidence on regulatory co-operation in the area of transboundary water management and through the fast development of transnational private regulation.