The rule that applies to financial rip-offs also applies to education. If it sounds too good to be true, it probably is. The claims that the Herald editorial makes on behalf of the American KIPP schools is a case in point.
To the extent KIPP schools succeed, it is because they (like most other charter schools) are manipulating their student intakes. They have been found to exclude special needs students and to "lose" up to 40 per cent of their African male students between grades 6 and 8 (Miron, G; Urschel, J; Saxton, N). The replacement students on the waiting list will tend to be more highly motivated and have more supportive parents so the school grades magically float up.
The other thing KIPP schools are renowned for is drilling and teaching to the test - again creating the impression that marks are improving, but whether there is any deep learning going on is a moot point. This battery-hen model of education is not what the charter school pushers would ever choose for their own children but, drawn by the profits to be made, they have no conscience about imposing 19th century educational ideals on poor communities.
The most distressing thing about charter schools in the US - and something that is certain to be replicated here - is their role in increasing ethnic and socio-economic segregation which is a direct consequence of their not having to take local students.
"Seven years after the Civil Rights Project first documented extensive patterns of charter school segregation, the charter sector continues to stratify students by race, class and possibly language." (Civil Rights Project, 2010 UCLA).