OK, maybe I'm underplaying the difference between the Promise Academy and KIPP.
During Promise Academy’s darkest days, Canada’s board kept pressing him to turn the school over to an outside group—the Knowledge is Power Program, or KIPP. Canada did not relish the prospect. According to Tough, Canada saw KIPP as operating a “dueling model.” KIPP, Canada thought, did not seek out the most troubled students. Moreover, its goal was to take those kids who could survive its strict program and lift them out of a troubled community, whereas Canada saw the school as part of the larger community and wanted to transform them both.
The Forman piece as a whole is highly recommended.