States and other educational entities receiving Part B funding under the Individuals with Disabilities Education Act (IDEA) submitted their Annual Performance Reports (APRs) and Section 618 Table 6 data together to the U.S. Secretary of Education on or before February 1, 2009. These reports may have been modified during the following few months, and so the National Center on Educational Outcomes (NCEO) waited until June to pull final data from these sources. These reports contained information on a variety of indicators, including large-scale assessment participation and performance data for the 2007-2008 school year. This document is a summary of the assessment data contained in those reports. Appendices include: (1) State-by-State Participation Data; (2) State-by-State Performance Data; (3) State-by-State Participation Raw Data; (4) State-by-State Performance Raw Data; and (5) State-by-State Performance Raw Data by Specific Assessment. (Contains 34 figures and 42 tables.)