Ongoing or recently completed across the United States are a series of lawsuits via which teacher plaintiffs are contesting how they are being evaluated using value-added models (VAMs) as part of states'/districts' teacher accountability systems. To investigate the empirical and pragmatic matters addressed in court, researchers conducted a case…

Recent lawsuits reveal common mistakes plaguing current teacher evaluation systems. Drawing on arguments in court documents for prominent cases, the authors find that evaluation systems using value-added measures (VAM) suffer from a) inconsistent and unreliable teacher ratings, b) bias toward and against teachers of certain types of students, c)…

The Every Students Succeeds Act (ESSA) loosened the federal policy grip over states' teacher accountability systems. We present information, collected via surveys sent to state department of education personnel, about all states' teacher evaluation systems post-ESSA, while also highlighting differences before and after ESSA. We found that states…