PPP projects will allocate very different levels of design risk to the project company, whether the project company provides the preliminary design, the detailed design and/or the working drawings, in particular the extent to which the project company warrants the design, the site data and concept that underlies the design. The project company may also take the risk of obtaining approvals for the design and its different elements. While design risk is an important measure for an investor considering a PPP project, it is not as useful when comparing projects across sectors and regions, would complicate the model significantly given the many different variations of design risk that may be taken by the project company.