This report was commissioned by the Scottish Executive to further its understanding of the performance of Public Private Partnership (PPP) projects in Scotland. The main aims of the research were; first, to provide an initial assessment of the relative costs and benefits of PPP procurement in comparison to conventional procurement, and of the underlying causes of good/bad performance and; second, to consider what data on PPP projects might usefully be collected in the future. The Scottish Executive was particularly interested in the operational performance of live projects; 64 PPP schemes are now operational in Scotland in sectors including health, education, transport and water.