OKPOLICY.ORG
[T]he difference between an A and a B is half a question. The difference between an A and an F is less than the difference than between an A and a D. Students who are in F schools have higher achievement in reading on average than students who are in D schools.
Curt Adams, a senior research scientist at the Oklahoma Center for Education Policy at the University of Oklahoma, on flaws in the state’s A-F school evaluation system
