Generally all of the host nations use contracts with a standard structure for their PPP projects, which includes (1) the agreement, (2) a common or core set of contract provisions and requirements, (3) project-specific contract provisions and requirements, and (4) common or project-specific schedules or "sheets."
In each country technical standards for various highway structures and components are specified by the government. Any deviations proposed by the private sector are usually assessed during the procurement stage for suitability. During the design and construction phases, the independent verifier typically provides periodic certification that design and construction are proceeding according to agreed-on standards. Early contracts, in some cases, provided too much flexibility to the private sector on technical provisions, but the nations have learned that the services they seek from PPP arrangements should not come at the expense of sound engineering practices.