Whether a surface transportation project is suitable for delivery as a PPP depends on a number of factors that relate to the legal and institutional environment within which the project will be developed and the specific attributes of the project itself. As a partnership between public sponsors and private providers, certain criteria are used by both public and private sector members of the PPP while some are applicable to one or the other partner. This section discusses the criteria public and private partners deem essential for entering into a PPP and for determining whether the partnership is successful.