
A year later, Feinberg and Levin started a classroom that operated nine hours a day instead of the normal seven, as well as on some Saturdays and during the summer. Within a year, the number of students performing at grade level in reading and math jumped to 90 percent from 50 percent.
Today the 50-pupil experiment has grown into the biggest U.S. charter-school operator, with 82 schools for poor and minority children in 19 states. The Obama administration cites the Knowledge Is Power Program, as the nonprofit system is known, as a model of the kind of education reform it hopes to spawn with $100 billion in stimulus money.