The OECD High-Level Principles for Integrity, Transparency and Effective Control of Major Events and related Infrastructures build upon lessons learned from the cooperation between the Italian Anti-Corruption Authority (ANAC) and the OECD in the development of infrastructure related to Expo Milano 2015. They provided a more general control template for institutional cooperation on the supervision of public contracting procedures and of their subsequent performance, in accordance with the highest possible standards and leading international best practices. The report presents a model that can be applied to many other large infrastructure projects that face the same challenges.