Research shows, however, that KIPP is an outlier and that charter school performance overall is "average" and in general charter schools perform about the same as public schools.
Alongside the school performance data on GCSEs and A-levels is a new measure of how schools perform on the basics of English and maths.
Because so many schools perform below the level the state thinks students should be reaching, the new performance numbers will often be negative.
It seems accountability did make schools perform better.
The better question: Why do some schools — or types of schools — perform better than others?
Equally poor Asians in the same bad schools perform significantly better than their black classmates.
The study does not explain why these schools perform so well.
The Credo report also admits that many charter schools perform worse than traditional ones.
Students educated in wealthy schools perform well as measured by standard educational benchmarks.
As much as a quarter of the state's elementary and secondary schools perform below standards.
Boston charter middle schools perform consistently across all standardized test subscales.
