This document summarizes findings from Ofsted about what has the most impact on growing great schools. According to Ofsted, strong leadership and culture have the greatest impact. Effective school leaders establish a culture of high aspirations where staff and students' voices shape development. Leaders also provide bespoke and continuous professional development to teachers to improve teaching, understand teachers' needs, and target areas needing improvement. Developing future leaders through mentoring, coaching, and leadership programs also builds the capacity needed to sustain school growth. Partnerships between schools and other organizations further support staff development and teacher training.