Public-private partnerships (PPPs) take a wide range of forms varying in the extent of involvement of and risk taken by the private party. The terms of a PPP are typically set out in a contract or agreement to outline the responsibilities of each party and clearly allocate risk. Different types of PPP are Concessions, Build-Operate-Transfer (BOT), Design-Build-Operate (DBO); Leases / Affermage, Full Divestiture, Contract Plans, and Performance Contracts.