In a provocative and influential paper, Jesse Rothstein (2010) finds that standard value-added models (VAMs) suggest implausible future teacher effects on past student achievement, a finding that obviously cannot be viewed as causal. This is the basis of a falsification test (the Rothstein falsification test) that appears to indicate bias in VAM…

Like many states throughout the nation, Pennsylvania is in the midst of major reforms to its teacher evaluation system. Under the new system, the state will base annual evaluations on several measures, including supervisor observations using the Framework for Teaching (FFT) and, for many teachers, their contributions to student achievement growth…