Education and political leaders across the country are currently trying to decide how to evaluate teachers. Some states are pushing for legislation to sort teachers into categories using unreliable mathematical calculations based on student test scores. Others have hired external evaluators who pop into classrooms with checklists to monitor and rate teachers. In all these scenarios, principals have only partial authority, with their judgments factored into a formula.

This type of system shows a profound lack of understanding of leadership. Principals need to create a culture of trust, teamwork and candid feedback that is essential to running an excellent school. Leadership is about hiring great people and empowering them, and requires a delicate balance of evaluation and encouragement. At Harlem Village Academies we give teachers an enormous amount of freedom and respect. As one of our seventh-grade reading teachers told me: “It’s exhilarating to be trusted..."