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Educator preparation, professional development, performance and evaluation

Stephanie Levin, Kathryn Bradley.

This report reviews findings from 35 major studies that speak to the question of principal turnover. Within these studies, researchers have examined principal turnover nationally and within states and districts, primarily investigating the relationships between principal turnover and various characteristics of principals, schools, students, and policies. While there is some consistency across studies, there is a good deal of variation in research questions, methods, and measurement of turnover. Further, few studies consider all the possible pathways out of the principalship, and few isolate the ways in which specific conditions or features of the principalship impact principals’ decisions to leave or districts’ decisions to retain principals. Despite these limitations, we found that, when examined together, these studies provided important information to help policymakers, education leaders, and other stakeholders understand and address principal turnover.

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Richard Ingersoll, Henry May, Greg Collins.

This study examines the extent and sources of the minority teacher shortage—the low proportion of minority teachers in comparison to the increasing numbers of minority students in the school system. Using the National Center for Education Statistics’ Schools and Staffing Survey/Teacher Follow-Up Survey, we found that efforts over recent decades to recruit more minority teachers and place them in disadvantaged schools have been very successful. But these efforts have been undermined by the high turnover rates of minority teachers—largely because of poor working conditions in their schools. The conditions most strongly related to minority teacher turnover were the degree of teachers’ classroom autonomy and input into school decisions—both increasingly important when coupled with accountability pressures.

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Daniel Espinoza, Ryan Saunders, Tara Kini, Linda Darling-Hammond.

Much is known about how to attract, develop, and retain a strong and stable teacher workforce, and states across the country are taking action to address their teacher shortages in ways that strengthen their overall teacher workforce. This report highlights research on six evidence-based policies that have been used to address teacher shortages and boost teacher recruitment and retention: service scholarships and loan forgiveness, high-retention pathways into teaching, mentoring and induction for new teachers, developing high-quality school principals, competitive compensation, and recruitment policies to expand the pool of qualified educators.

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Desiree Carver-Thomas, Linda Darling-Hammond.

Without changes in current policies, U.S. teacher shortages are projected to grow in the coming years. Teacher turnover is an important source of these shortages. About 8% of teachers leave the profession each year, two-thirds of them for reasons other than retirement. Another 8% shift to different schools each year. In addition to aggravating teacher shortages, high turnover rates lower student achievement and are costly for schools. This report examines turnover trends and causes. It concludes that policies to stem teacher turnover should target compensation, teacher preparation and support, and teaching conditions.

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Marianne Bitler, Sean P. Corcoran, Thurston Domina, Emily Penner.

Estimates of teacher “value-added” suggest teachers vary substantially in their ability to promote student learning. Prompted by this finding, many states and school districts have adopted value-added measures as indicators of teacher job performance. In this paper, we conduct a new test of the validity of value-added models. Using administrative student data from New York City, we apply commonly estimated value-added models to an outcome teachers cannot plausibly affect: student height. We find the standard deviation of teacher effects on height is nearly as large as that for math and reading achievement, raising obvious questions about validity. Subsequent analysis finds these “effects” are largely spurious variation (noise), rather than bias resulting from sorting on unobserved factors related to achievement. Given the difficulty of differentiating signal from noise in real-world teacher effect estimates, this paper serves as a cautionary tale for their use in practice.

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Matthew Kraft, Eric Brunner, Shaun Dougherty, David Schwegman.

In recent years, states have sought to increase accountability for public school teachers by implementing a package of reforms centered on high-stakes evaluation systems. We examine the effect of these reforms on the supply and quality of new teachers. Leveraging variation across states and time, we find that accountability reforms reduced the number of newly licensed teacher candidates and increased the likelihood of unfilled teaching positions, particularly in hard-to-staff schools. Evidence also suggests that reforms increased the quality of new labor supply by reducing the likelihood new teachers attended unselective undergraduate institutions. Decreases in job security, satisfaction, and autonomy are likely mechanisms for these effects.

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Anne Podolsky, Linda Darling-Hammond, Christopher Doss, Sean Reardon.

Despite wide achievement gaps across California between students from different racial and socioeconomic backgrounds, some school districts have excelled at supporting the learning of all their students. This analysis identifies these positive outlier districts—those in which students of color, as well as White students, consistently achieve at higher levels than students from similar racial/ethnic backgrounds and from families of similar income and education levels in most other districts. These results are predicted, in significant part, by the qualifications of districts’ teachers, as measured by their certification and experience. In particular, the proportion of underprepared teachers—those teaching on emergency permits, waivers, and intern credentials—is associated with decreased achievement for all students, while teaching experience is associated with increased achievement, especially for students of color.

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Thomas S. Dee, Jessalynn James, James Wyckoff.

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 evidence of efficacy, the early promise of teacher evaluation may not sustain as these systems mature and change. This study examines the evolving design of IMPACT, the teacher evaluation system in the District of Columbia Public Schools (DCPS). We describe the recent changes to IMPACT which include higher performance standards for lower-performing teachers and a reduced emphasis on value-added test scores. Descriptive evidence on the dynamics of teacher retention and performance under this redesigned system indicate that lower-performing teachers are particularly likely to either leave or improve. Corresponding causal evidence similarly indicates that imminent dismissal threats for persistently low-performing teachers increased both teacher attrition and the performance of returning teachers. These findings suggest teacher evaluation can provide a sustained mechanism for improving the quality of teaching.

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Jessalynn James, James Wyckoff.

Few topics in education policy have received more attention than teacher turnover—and rightly so. The cost of losing a good teacher can be substantial and is born most directly by students. It is now widely recognized that teachers differ considerably in their ability to improve student outcomes, but discussions of teacher turnover rarely reflect these differences. Instead, we typically treat teacher turnover as uniformly negative. In this paper, we examine teacher turnover in the context of rigorous teacher evaluation to explore three questions. How does teacher turnover affect the quality of teaching and student achievement? How does teacher turnover vary by measured teaching effectiveness? And to what extent is the turnover of effective teachers associated with the evaluation system? We examine these questions employing data from the District of Columbia Public Schools. We find that in general turnover improves teacher quality and student achievement, but that this result masks large differences between teachers identified as more and less effective. Turnover among more effective teachers is relatively low, and when more-effective teachers exit, they infrequently report the evaluation system as a reason.

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David D. Liebowitz.

Teacher evaluation policies seek to improve student outcomes by increasing the effort and skill levels of current and future teachers. Current policy and most prior research treats teacher evaluation as balancing two aims: accountability and growth. Proper teacher evaluation design has been understood as successfully weighting the accountability and growth dimensions of policy and practice. I detail six assumptions underlying teacher evaluation for growth and accountability and assess their reasonableness in light of empirical evidence from the personnel economics, social psychology and management literatures. I simulate a set of teacher evaluation policies and find that those that treat evaluation for accountability and evaluation for growth as substitutes modestly outperform policies that treat them as complements. The teachers’ rates of learning through evaluation and the labor market effects of evaluation are critical in determining its impact. I conclude with recommendations for the design of teacher evaluation policies.

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