As illustrated in Appendix A.1, the funding provided by commercial lenders may be as high as 90 percent of the total funding required for the project. The potential risk of such high exposure to project performance means that the banks will be closely involved in the transaction. They will need to not only negotiate the terms and price of loans, but also understand the commercial proposition and the circumstances that could result in them not being repaid. The banks' due diligence can bring rigor to the transaction analysis and reassure the public authorities about the robustness of the private-sector proposal.