States and other educational entities receiving Part B funding under the Individuals with Disabilities Education Act (IDEA) submitted their Annual Performance Reports to the U.S. Secretary of Education on or before March 31, 2004. These reports contained information on a variety of indicators, including assessment participation and performance results for 2002-2003 state assessments. This document is a summary of the 2002-2003 state assessment information that was submitted by states in their Annual Performance Reports. It is important to recognize that the information submitted in a state's Annual Performance Report may or may not be publicly reported by the state. The National Center on Educational Outcomes (NCEO) regularly analyzes assessment information that is publicly reported by states (see Thurlow & Wiley, 2004; Thurlow, Wiley, & Bielinski, 2003). NCEO also analyzed states' Biennial Performance Reports that included assessment data for the 2000-2001 year (Thurlow, Wiley, & Bielinski, 2002). The assessment information included in the Annual Performance Reports of regular states (n = 50) and unique states subject to IDEA requirements (n = 9; see box below for a list of unique states) is summarized in two sections in this report: (1) Participation in 2002-2003 State Assessments (see page 2); and (2) Performance on 2002-2003 State Assessments (see page 20). The information in the above sections is supported by state-by-state data in the appendices. Appendices A and B provide the participation and performance data used to create the tables and figures in this document. Appendices C and D include a summary of all of the participation and performance data states submitted in their 2002-2003 Annual Performance Reports of state assessment data.