Strong leadership is the most important factor in determining students' success, according to a University of Minnesota study that surveyed 8,000 educators in nine states. The study also found that replacing principals just to make a change can have a negative effect on achievement. "Leadership makes a huge difference, and I think anybody who's in the field knows that," one researcher said. "But we've not had good empirical research-based information that has proven that, and that's what I think that study does."
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