Commending the Tamil Nadu Government for experimenting with public-private partnership in infrastructure finance and development, the World Bank has suggested putting in place a clear regulatory framework to support such partnerships.In its special report on Economic Growth and Poverty Alleviation in Tamil Nadu, the WB's Poverty Reduction and Economic Management Unit said that the framework should define the role of the government and the private sector, lay out risk sharing principle and also regulate the tariff system regime for private roads.