The rating on Illinois Development Finance Authority's (IDFA) bonds, issued for Mendota Community Consolidated School District Board of Education No. 289, reflects the security provided by an irrevocable intercept of general state aid to a trustee in amounts sufficient to meet debt service requirements. The IDFA will purchase local government securities from the obligor, the payments on which are then applied to service the Qualified Zone Academy Bonds (QZABs) issued by IDFA. The QZABs are double-tax exempt and payable in a single principal maturity due Dec. 21, 2011. No interest payments are made; instead, bondholders receive credits to federal income taxes. The local government securities issued by the district are GO lease agreements that irrevocably pledge general state aid. Under