Turnover among teachers and principals has risen since the start of the coronavirus pandemic, but are less acute this school year than the prior one, according to a RAND Corp. report. Survey data, collected late last year from 300 school district and charter school network leaders, indicate that principal turnover was 16% nationwide in the 2021-22 school year -- up 13 percentage points from pre-pandemic levels -- and teacher turnover grew 4 percentage points to 10% across the US.