Quote from Kevin Schmit:
What problems?
The percent of the variance in educational outcomes explained by ALL in-school effects (including teachers, class size, spend-per-pupil, etc.) is between 5% and 15%. Probably closer to 5%. Teachers and schools have very little influence on the end result.
Corrected for non-school cofactors, US education is among the best in the world. It's easy enough to run the numbers yourself. Relevant data are availble on www.pisa.oecd.org and www.census.gov.
You made one of my main points nicely, thank you. The causes of the problems do not lie with the teachers or the schools. And the data you refer to shows that to be the case.
You asked what the problems were, and I enumerated some of them for you. See my earlier post for a list.
But for causes you must look beyond teachers and schools. For that see the remainder of my post.