States worldwide are shifting toward collaboration with the private sector, particularly for the provision of large-scale infrastructure projects. This bookfocuses on the growing reliance on public-private partnerships and concessions to address societal needs. This shift entails new roles for state that were often committed to dirigisme in the recent past. They now need to learn capabilities to manage, design, monitor and implement working relationships with the private sector and civil society. The analysis links these innovations to the reform processes of the latter part of the twentieth-century by providing in-depth accounts of large-scale transportation projects in various countries and regions, with particular attention to Latin America.