The principal plays a key role in facilitating school improvement and professional learning for teachers. As an agent of change, the principal must intentionally address barriers to teacher learning, such as focusing too much on confirming existing ideas rather than challenging them. Some strategies for interrupting barriers include using protocols to structure discussion, making preconceptions explicit, and viewing mistakes as learning opportunities. The principal also ensures school goals are aligned to student needs based on data and provides resources to support teachers in achieving goals.