Standard&Poor's Ratings Services assigned its 'A+' rating to the Board of Trustees of Southern Illinois University's $69.1 million housing and auxiliary facilities system (HAFS) revenue bonds, series 2006A, issued for Southern Illinois University (SIU). Additionally, Standard&Poor's affirmed its 'A+' underlying rating (SPUR) on the board's outstanding debt, also issued for SIU. The rating reflects the university's: Funding position within the state of Illinois' ('AA/Stable') system of higher education; Comprehensive course offerings, including medicine, law, engineering, and dental programs; Stable demand and enrollment; Adequate liquidity relative to pro forma debt, with 2005 adjusted unrestricted net assets equal to 35% of pro forma debt; and Low overall debt burden of 3% of expenses and the self-supporting nature of