The Eleventh Five Year Plan has set an ambitious target of increasing total investment in infrastructure from around 5% of GDP in the base year of the Plan 2006-07 to 9% by the terminal year 2011-2012. This paper provides an assessment of the investment required by the Central and State Governments and the private sector in the ten major physical infrastructure sectors for sustaining a growth rate of 9 per cent in GDP over the Eleventh Plan (2007-08 to 2011-12).