We study the returns to experience in teaching, estimated using supervisor ratings from classroom observations. We describe the assumptions required to interpret changes in observation ratings over time as the causal effect of experience on performance. We compare two difference-in-differences strategies: the two-way fixed effects estimator common…

Over several weeks of the late Spring and early Summer of 2010, along with a bright summer intern, the author visited a dozen DCPS schools. The alleged purpose was to collect feedback on the design of an expanded testing program. These meetings were informative, animated, and very well attended. School staff appreciated the apparent opportunity to…

Teacher evaluation systems that use in-class observations, particularly in high-stakes settings, are frequently understood as accountability systems intended as nonintrusive measures of teacher quality. Presumably, the evaluation system motivates teachers to improve their practice--an accountability mechanism--and provides actionable feedback for…

The transition to new assessments aligned to the Common Core State Standards was a significant turning point in the standards' implementation. Concerns about the transition led districts to suspend the use of value-added scores for evaluating teachers, but changes to other measures, such as classroom observations, were rare. Using data from the…

Ten years ago, many policy makers viewed the reform of teacher evaluation as a highly promising mechanism to improve teacher effectiveness and student achievement. Recently, that enthusiasm has dimmed as the available evidence suggests the subsequent reforms had a mixed record of implementation and efficacy. Even in districts where there was…

Teacher turnover is an enduring concern in education policy and can incur substantial costs to students. Policies often address turnover broadly, yet effects turn on net differences in the effectiveness of exiting and entering teachers, in addition to the disruption dealt to classrooms. Recent research has shown mixed effects of teacher evaluation…

Ten years ago, many policymakers viewed the reform of teacher evaluation as a highly promising mechanism to improve teacher effectiveness and student achievement. Recently, that enthusiasm has dimmed as the available evidence suggests the subsequent reforms had a mixed record of implementation and efficacy. Even in districts where there was…

When the District of Columbia's city councilors handed Mayor Adrian Fenty control of the city's public schools in 2007, they were hoping for salvation. Or maybe just absolution. Fenty appointed Michelle Rhee, then-president of The New Teacher Project, as chancellor. She and her longtime colleague and eventual successor Kaya Henderson spent the…

School leadership is a key factor in school turnarounds. The general prescription for what school leaders should do tends to be this: Set high expectations for staff and students and give strong instructional supports. Most school systems recognize how tall an order this is, given everything else the principal job entails. Even principals who are…

The value of both Common Core State Standards (CCSS) and efforts to embrace the idea that teachers should be held accountable for students' test scores have been debated among practitioners, policy makers, and the public for many years, but increasingly since 2010. The Common Core State Standards was implemented in 2009 to provide a basis for new…

In current teacher evaluation systems, the two main purposes of evaluation--accountability/goal accomplishment (summative) and professional growth/improvement (formative)--are often at odds with one another. However, they are not only compatible, but linking them within a unified teacher evaluation system may, in fact, be desirable. The challenge…

In practice, teacher turnover appears to have negative effects on school quality as measured by student performance. However, some simulations suggest that turnover can instead have large, positive effects under a policy regime in which low-performing teachers can be accurately identified and replaced with more effective teachers. This study…

Using administrative data from D.C. Public Schools, I use exogenous variation in the presence and intensity of teacher monitoring to show it significantly improves student test scores and reduces suspensions. Uniquely, my setting allows me to separately identify the effect of pre-evaluation monitoring from post-evaluation feedback. Monitoring's…

Teachers in the United States are compensated largely on the basis of fixed schedules that reward experience and credentials. However, there is a growing interest in whether performance-based incentives based on rigorous teacher evaluations can improve teacher retention and performance. The evidence available to date has been mixed at best. This…

Teachers in the United States are compensated largely on the basis of fixed schedules that reward experience and credentials. However, there is a growing interest in whether performance-based incentives based on rigorous teacher evaluations can improve teacher retention and performance. The evidence available to date has been mixed at best. This…