As a result of following up with districts that employ nontraditional service providers, the authors have made several corrections to the 2006 and 2007 privatization surveys. For 2006, survey results have been revised upward owing to Inland Lakes' use of a nontraditional service provider. The 2007 survey results also have been adjusted upward to include Armada, Whittemore-Prescott and Cass City, all of which employee contracting services. Also in 2007, Lowell reported one privatized custodian; however, the custodian was contracted for less than the entire school year; the 2007 results have been revised to reflect this. All figures from prior years published in this year's survey reflect these corrections and revisions.