We evaluate to determine curriculum effectiveness, compare achievement levels, and evaluate student knowledge. Barriers to accurate assessment include individual learning differences, media constraints, lack of appropriate supports, and lack of curriculum integration. To increase assessment accuracy and accessibility, assessments need flexibility in presentation, expression and strategic supports, and engagement. Flexibility involves varied media, supports, technology tools, embedded assessments, varied content, and motivation as "the essential engine of learning".

1. Universal Design for Learning Breaking the Barriers May 29, 2008