Los Angeles has more charter schools than any other school district in the nation, and it's a very bad idea.

Billionaires like privately managed schools. Parents are lured with glittering promises of getting their kids a sure ticket to college. Politicians want to appear to be champions of "school reform" with charters.

But charters will not end the poverty at the root of low academic performance or transform our nation's schools into a high-performing system. The world's top-performing systems — Finland and Korea, for example — do not have charter schools. They have strong public school programs with well-prepared, experienced teachers and administrators. Charters and that other faux reform, vouchers, transform schooling into a consumer good, in which choice is the highest value.

The original purpose of charters, when they first opened in 1990 (and when I was a charter proponent), was to collaborate with public schools, not to compete with them or undermine them. They were supposed to recruit the weakest students, the dropouts, and identify methods to help public schools do a better job with those who had lost interest in schooling. This should be their goal now as well.

Instead, the charter industry is aggressive and entrepreneurial. Charters want high test scores, so many purposely enroll minimal numbers of English-language learners and students with disabilities. Some push out students who threaten their test averages. Last year, the federal General Accountability Office issued a report chastising charters for avoiding students with disabilities, and the ACLU is suing charters in New Orleans for that reason....