Over the last fifteen years, governments around the world pursued policies to involve the private sector in the delivery and financing of infrastructure services. Private participation in infrastructure (PPI) and reforms were driven by the high costs and poor performance of state-owned network utilities. The scale of this move away from the dominant public sector model was far more rapid than had been anticipated at the start of the 1990s with investment flows peaked at US$114 billion in 1997. But they sharply fall after that, and recently recovered.

The following resources aim at providing the broader context in which the data collected by the PPI Project database have taken place. The resources include toolkits to design PPI schemes, websites that contains papers discussing PPI issues or transaction information, and selected reading lists of papers dealing with private participation in the different infrastructure sectors, and reviewing country or project level experiences.