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. Author manuscript; available in PMC: 2011 Jul 15.
Published in final edited form as: Child Dev Perspect. 2009 Apr;3(1):30–37. doi: 10.1111/j.1750-8606.2008.00072.x

Figure 1.

Figure 1

A three-tier model for increasingly intense academic and behavioral interventions. The percentages represent estimates of the number of children who are at grade level (Tier 1) and who require Tier 2 and Tier 3 services. Note. From Response to Intervention: Policy Considerations and Implementation (p. 22), National Association of State Directors of Special Education, Inc., 2006, Alexandria, VA: Author. Copyright 2006 by the National Association of State Directors of Special Education, Inc. Reprinted with permission.