This report highlights the findings of the sixteenth survey of states conducted by the National Center on Educational Outcomes (NCEO). It has been administered for more than three decades to collect information from states about the participation and performance of students with disabilities in the assessments that comprise the comprehensive assessment system. Topics addressed included: accessibility and accommodations, alternate assessments based on alternate academic achievement standards (AA-AAAS), interim assessments, accountability, English learners with disabilities, technology, graduation requirements, State Systemic Improvement Plans (SSIPs)/State-identified Measurable Results (SiMRs), family engagement, and technical assistance needs.