This document discusses the role of school principals as instructional leaders and the impact of effective leadership on student achievement. It reviews research showing that leadership is second only to classroom instruction in influencing learning and that effective principals can increase student achievement by 2-7 months in one year. The document also examines the challenges principals face, such as feeling their jobs are too complex and experiencing high stress levels. It then outlines the key activities of instructional leaders, such as coaching teachers, using data to inform instruction, and focusing on adult learning. Overall, the summary emphasizes that school principals indirectly improve teaching and learning most powerfully through their influence on staff motivation, commitment, and working conditions.