Expansion of the use of student test score data to measure teacher performance has fueled recent policy interest in using those data to measure the effects of school administrators as well. However, little research has considered the capacity of student performance data to uncover principal effects. Filling this gap, this article identifies…

Teachers are systematically sorted across schools. Often, schools serving the lowest-achieving students are staffed by the least-skilled teachers. While teachers' school preferences account for some of the sorting, school practices are also likely to be a key factor. Using value-added methods, the authors examine the relationship between a…