Ineffective teachers were more likely to leave voluntarily after New York City principals got tougher on awarding tenure, according to a working paper by Stanford researchers. After a new policy was adopted in 2009-10, few teachers were denied tenure but many more had their probationary period extended instead of receiving tenure.
“Extended” teachers who were less effective — by principals’ judgments and value-added measures — were the most likely to leave, reports Ed Week‘s Stephen Sawchuck. They were replaced by stronger teachers, on average.
The district started supplying more data on teachers to principals, asking them to weigh performance observations, reviews of teachers’ lesson plans, and in limited instances “value-added” data based on test scores. And it began requiring principals to justify their decisions about whether to grant or deny tenure—particularly if it didn’t match up with the data. Principals could also extend the tenure decision for another year if they weren’t ready to make a final call.
The new policy improved the overall quality of the teaching force, the study concluded.
Teachers in schools with high concentrations of black and low-performing students were more likely to be “extended,” the study found. “We have a chicken-and-the-egg problem here,” said United Federation of Teachers spokesman Dick Riley. “Were people less likely to have probation extended because their kids are more successful, or is it the other way around?”