Many factors should be considered in formally evaluating a teacher; however, nothing is more important than effectiveness in the classroom. Value-added models are an important tool for measuring student achievement and school effectiveness.[1] These models have the ability to measure individual students' learning gains, controlling for students' previous knowledge and background characteristics. While some research suggests value-added models are subject to bias and statistical limitations,[2] rich data and strong controls can eliminate error and bias.[3] In the area of teacher quality, examining student growth offers a fairer and potentially more meaningful way to evaluate a teacher's effectiveness than other methods schools use.
Unfortunately, districts have used many evaluation instruments, including some mandated by states, which are structured so that teachers can earn a satisfactory rating without any evidence that they are sufficiently advancing student learning in the classroom.[4] Teacher evaluation instruments should include factors that combine both human judgment and objective measures of student learning.[5]
[1] Hanushek, E. A., & Hoxby, C. M. (2005). Developing value-added measures for teachers and schools.
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Using student progress to evaluate teachers: A primer on value-added models. Educational Testing Service.
[2] Rothstein, J. (2009). Student sorting and bias in value-added estimation: Selection on observables and unobservables.
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[3] Chetty, R., Friedman, J. N., & Rockoff, J. E. (2014). Measuring the impacts of teachers II: Teacher value-added and student outcomes in adulthood.
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[4] Weisberg, D., Sexton, S., Mulhern, J., Keeling, D., Schunck, J., Palcisco, A., & Morgan, K. (2009).
The widget effect: Our national failure to acknowledge and act on differences in teacher effectiveness. New Teacher Project.; Glazerman, S., Loeb, S., Goldhaber, D., Staiger, D., Raudenbush, S., & Whitehurst, G. (2010).
Evaluating teachers: The important role of value-added. Washington, D.C.: Brookings Institution.
[5] Kane, T. J., Taylor, E. S., Tyler, J. H., & Wooten, A. L. (2011). Identifying effective classroom practices using student achievement data.
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46(3), 587-613.; Taylor, E. S., & Tyler, J. H. (2012). The effect of evaluation on teacher performance.
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