They are more likely to make sense where they help address other issues, including risk sharing, technical expertise, and project design and management. A recent OECD survey found that the lack of adequate capacity for sub-national governments to manage PPPs was seen as a significant challenge by 16 of 19 responding OECD country governments (OECD, 2013c). Governments wishing to expand the role of private finance in urban public investment may therefore need to address these capacity issues before proceeding very far - for example, by establishing dedicated PPP units that can work with local authorities (OECD, 2010d).