Public-private partnerships (PPP) are effective instruments for promoting private and public investment in public sectors. It is an administrative contract concluded for valuable consideration, by which a public authority entrusts the supply of equipment or the financing of road, energy, water, social, cultural and sports infrastructures for a fixed period.The present document is an essential tool for risk management, as part of the process of drawing up the reference document dividing the costs between the partners involved in the partnership contract. It is a procedure that demonstrates the technical, financial and legal sustainability of the partnership project, and results in the creation of an agreed contract, using simple, adaptable formulas.