Financing is only one element of PPP. The conception that PPP projects are principally about private sector financing of public infrastructure are not strictly correct. The essence of a PPP is that the public sector is purchasing a stream of services under specified terms and conditions. (Grimsey & Lewis 2004: 6.) Different motives for PPP can be classified, as Table 1 shows. PPPs can change the public sector in many ways. PPPs are a tool for management reform