Decades of research find that effective school leadership and access to high-quality early education are two of the most important determinants of educational outcomes. School principals affect both teacher and student performance and play an important role in turning around troubled schools. High-quality education, from prekindergarten (pre-K) through third grade builds foundational knowledge and skills that prepare students for long-term success.
Source: National Governors Association
Available at: http://www.nga.org/files/live/sites/NGA/files/pdf/2013/1306LeadingForEarlySuccessPaper.pdf