ATLANTA — Offering big bonuses to teachers failed to raise students' test scores in a three-year study released Tuesday that calls into question the Obama administration's push for merit pay to improve education.
The study, conducted in the metropolitan Nashville school system by Vanderbilt University's National Center on Performance Incentives, was described by the researchers as the nation's first scientifically rigorous look at merit pay for teachers.
It found that students whose teachers were offered bonuses of up to $15,000 a year for improved test scores registered the same gains on standardized exams as those whose teachers were given no such incentives.
"I think most people agree today that the current way in which we compensate teachers is broken," said Matthew Springer, executive director of the Vanderbilt center and lead researcher on the study. "But we don't know what the better way is yet."
The study comes as the Obama administration encourages school systems to link teacher pay and tenure to how students perform on tests and other measures of achievement.
The researchers looked at fifth- through eighth-grade math teachers from 2007 to 2009. A group of about 300 teachers started out in the study; half were eligible for the bonuses, the other half were not.
The bonuses were given out based on improvements in scores on Tennessee's standardized exam, which is used by the state as part of the federal No Child Left Behind requirements.
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