Oklahoma is one of 16 states electing to use an A-F letter grade as an indicator of school quality. On the surface, letter grades are an attractive policy instrument for school improvement; they are seemingly clear, simple, and easy to interpret. Evidence, however, on the use of letter grades as an instrument to rank and improve schools is scant…

The students who have the most difficulty reaching accountability standards in Wake County Public Schools are those with more than one of the following characteristics: recipients of free or reduced-price lunch, students with disabilities, and/or students with limited English proficiency. The Evaluation and Research Department identified…