The decrease in public investment in recent decades, partly due to the lack of public spending needs, has generated growing interest in alternative financing models for public works and in forms of Public-Private Partnership (PPP) (Raganelli, 2017). The PPP represents one of the most important resources available to the PA for the financing, construction and management of infrastructures and / or the provision of services of public interest. It consists of a series of forms of cooperation between the public and private sectors, through which both parties have the opportunity to achieve the objectives they have set themselves, also guaranteeing - based on the analysis of the results achieved ex post - a better quality of services provided. The most common type of PPP is the concession of public works, that is a contract for the design, construction and management of a public or public utility work that can be entrusted through traditional procedures (open and / or restricted) or through the innovative administrative procedure of Project Finance (Taronna, 2014).