Irrespective of the procurement structure used, any public sector authority should have a methodology to demonstrate that Value for Money (VFM) has been achieved. It is clear that this is not always easy to do, however. Across the world, methodologies for assessing whether PPP deals offer VFM have been developed and used with some success. Overall, VFM testing considers whether the procurement structure being considered offers a lower overall cost (in present value terms) relative to an estimate of the risk-adjusted costs were the public sector to deliver the project itself (commonly referred to as the Public Sector Comparator, or PSC).