School Leaders Matter
Measuring The Impact Of Effective Principals

This study provides new evidence on the importance of school leadership by estimating individual principals’ contributions to growth in student achievement.

Our results indicate that highly effective principals raise the achievement of a typical student in their schools by between two and seven months of learning in a single school year; ineffective principals lower achievement by the same amount. These impacts are somewhat smaller than those associated with having a highly effective teacher. But teachers have a direct impact on only those students in their classroom; differences in principal quality affect all students in a given school.