Standard&Poor's Ratings Services assigned its 'AAA' rating, and stable outlook, to Plano, Texas' series 2006 GO bonds and series 2006 combination tax and revenue certificates of obligation. The rating reflects the city's: Deep, diversified economic and employment base; Significantly above-average wealth and income levels; Conservative and sophisticated financial and debt management policies, which include long-range budget and capital plans; Solid general fund reserve levels, which are augmented by additional reserves in various funds, providing significant revenue-raising flexibility; and Manageable debt levels, enhanced by rapid principal amortization and an increasing percent of capital improvements done as pay-as-you-go financing, as well as limited debt needs in the future. The city's full faith and credit pledge secures the bonds. An ad