Researchers have noted only half as much variation in student achievement between schools as across classrooms within the same school, underscoring the impact of teachers on student learning. (gatesfoundation.org)
Leithwood and Mascall (2008) reported that collective leadership, which included teacher leadership in addition to leadership by all school personnel, accounted for the largest amount of variation in student achievement scores, compared to other factors such as socio - economic status. (mspkmd.net)
Coleman found that variation in school resources (as measured by per - pupil spending and student - to - teacher ratios) was unrelated to variation in student achievement on standardized tests. (educationnext.org)