Teacher turnover occurs during and at the end of the school year, although documentation of within-year turnover currently rests on anecdotal evidence. On average, over 4.6% of teachers turn over during the school year, which amounts to 25% of total annual turnover. Teachers transfer within districts at higher rates at the beginning of the school…

Boosting early retirement in cash-strapped districts does not hurt students' math and reading scores, according to new studies released at the American Economic Association meeting, but pension-incentive programs may cost schools some of their most effective teachers. Separate studies of teachers in California, Illinois, and North Carolina paint a…