This volume presents case studies of customs modernization initiatives in eight developing countries: Bolivia, Ghana, Morocco, Mozambique, Peru, the Philippines, Turkey, and Uganda. The purpose of these case studies was to obtain a firsthand view of how these countries undertook customs reforms and to assess their success. The overall lessons learned from these studies are presented in chapter 2 of the Customs Modernization Handbook (World Bank forthcoming), a companion volume that provides policymakers, practitioners, and project managers from development agencies with an overview of the key issues they need to address in preparing and implementing customs modernization initiatives. The audience for the Customs Modernization Handbook is customs officials who are called on to design and implement customs reform and modernization strategies, as well as staff members of the World Bank and of other multilateral and bilateral development agencies who support developing countries in implementing such strategies. All the case studies except for the one on Ghana were prepared using basically the same methodology, which aimed at identifying the origins of the reforms, the main drivers, and the outcomes. The Ghana case study is somewhat different, because it focuses on how the automation of trade and customs processes took the lead in the trade facilitation and customs reform.