The use of data to inform decisionmaking and practice at the school and district levels is now a common feature of reform efforts. Advances in districts' technological capacities have produced data systems that allow a flow of data to and from schools, often to the point of creating an overwhelming flood of information. To make the flow of…

Two decades of research have documented what now is common knowledge: no in-school factor matters more to students' educational experiences and outcomes than the effectiveness of their teacher. As a result, the national airspace is increasingly crowded with proposed reforms and initiatives designed to boost teacher performance, including new…