The design-build-finance-operate ("DBFO") and Design-Build-Finance-Operate-Maintain ("DBFOM") delivery approaches are a variation of the DBOM approach. The major difference is that in addition to the design, construction, and operation of the project, the contractor is also responsible for all or a major part of the project's financing. The potential advantages of the DBFO and DBFOM approaches are the same as those under the DBOM approach but also include the transfer of the financial risks to the private partner during the contract period. While the project sponsor retains ownership of the facility, the DBFO and DBFOM approaches attract private financing for the project that can be repaid with revenues generated during the facility's operation. All or a portion of the revenue used to repay the private financing can be generated by the facility itself, but revenue generated by the public sector through taxes or other public sources can also be used to repay all or a portion of the private financing. Utilizing long-term public sources of revenue to pay down privately financed projects allows the public sector to enjoy some of the benefits available with a leveraged project without issuing bonds or otherwise incurring debt on its balance sheet.