Chalkbeat reports that Eva Moskowitz wrote a letter to parents of students in her high school, explaining why 70% of the teachers left in one year.

High expectations are hard on everyone, she says. Draconian punishment is not easy.

But in the end, her methods pay off, she says. Only 33% of KIPP graduates persist to finish college. Of course, we have no idea how many of Eva’s 16 high school graduates will finish college because they graduated only a month ago.