The Guide to Guidance is principally aimed at public procurement authorities considering the use of public-private partnership (PPP) arrangements. The rationale for using a PPP arrangement instead of conventional public procurement rests on the proposition that optimal risk sharing with the private partner delivers better value for money for the public sector and ultimately the end user. PPP arrangements are more complex than conventional public procurement. They require detailed project preparation and planning, proper management of the procurement phase to incentivise competition among bidders. They also require careful contract design to set service standards, allocate risks and reach an acceptable balance between commercial risks and returns. These features require skills in the public sector which are not typically called for in conventional procurement. This Guide to Guidance (the Guide ) seeks to identify the best of breed guidance currently available from PPP guidelines worldwide and selected professional publications. By providing a sourcebook of good PPP practice, it is designed to assist public officials responsible for launching and implementing PPP projects and to facilitate their understanding of the key issues and procedures involved in the procurement of PPP arrangements. The need for well-structured PPPs has never been greater. EU Member States and the European Commission have placed emphasis on the need to accelerate investment in infrastructure, by mobilising public and private sector finance through PPP arrangements as part of a strategy to address the economic downturn.