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About CTB National Center on Response to Intervention assigns highest ranking to CTB/McGraw-Hill's Yearly ProgressPro RTI Solution receives top rating for classification accuracy, reliability, and validity. (6/17/09) File: ctb_pr_NCRTI_YPP_6_15_09b2.pdf  (93KB PDF) (opens new browser window) To view this file you'll need Adobe Acrobat Reader. Download it for free from the Adobe Web site. (opens new browser window)

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