Section 170.611 - What special provisions apply to ISDEAA contracts and agreements?(a)Multi-year contracts and agreements. The Secretary can enter into a multi-year TTP self-determination contract and self-governance agreement with a Tribe under sections 105(c)(1)(A) and (2) of ISDEAA. The amount of the contracts or agreements is subject to the availability of appropriations.(b)Consortia. Under title I and title IV of ISDEAA, Tribes and multi-tribal organizations are eligible to assume TTPs under consortium contracts or agreements. For an explanation of self-determination contracts, refer to title I, 25 U.S.C. 450f . For an explanation of self-governance agreements, see title IV, 25 U.S.C. 450b(l) and 458b(b)(2) .(c)Advance payments. The Secretary and the Tribe must negotiate a schedule of advance payments as part of the terms of a self-determination contract under 25 CFR 900.132 .(d)Design and construction contracts. The Secretary can enter into a design/construct TTP self-determination contract that includes both the design and construction of one or more TTP projects. The Secretary may make advance payments to a Tribe: (1) Under a self-determination design/construct contract for construction activities based on progress, need, and the payment schedule negotiated under 25 CFR 900.132 ; and(2) Under a self-governance agreement in the form of annual or semiannual installments as indicated in the agreement.