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State Test Score Trends Through 2007-08, Part 2: Is There a Plateau Effect in Test Scores?
Many in the research and policy worlds have taken for granted the existence of a phenomenon known as the "plateau effect," wherein test scores rise in the early years of a test-based accountability system and then level off. The Center on Education Policy looked for evidence of a plateau effect in 55 trend lines from 16 states with six to ten years of consistent test data. This report outlines those findings. The Center on Education Policy, July 21, 2009

 
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