Measuring the Status and Change of NAEP State Inclusion Rates for Students with Disabilities
"Since the late 1990s, participation rates of students with disabilities (SDs) in the National Assessment of Educational Progress (NAEP) from different states have fluctuated. To address concerns that these changes may affect the validity of reports on achievement trends, NAEP has
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instituted policies for providing test accommodations for students with disabilities;
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developed a methodology to correct for the bias resulting from changing inclusion rates, and
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implemented procedures to increase the number of students with disabilities who are included as test-takers, such as better training of field staff, better procedures to assign proper accommodations for students, and improved communications with schools..."