The methods raised students’ test scores, and the schools began to attract the attention of the media and of philanthropists. A “60 Minutes” report on the schools in 1999 led to a $15 million grant from Doris and Donald Fisher, the founders of the Gap, and Feinberg and Levin began gradually to expand KIPP into a national network. Two years ago, they received $8 million from the Gates Foundation to create up to eight KIPP high schools. There are now 52 KIPP schools across the country, almost all middle schools, and together they are educating 12,000 children. The network is run on a franchise model; each school’s principal has considerable autonomy, while quality control is exercised from the home office in San Francisco. Feinberg is the superintendent of KIPP’s eight schools in Houston, and Levin is the superintendent of the four New York City schools.

KIPP is part of a loose coalition with two other networks of charter schools based in and around New York City. One is Achievement First, which grew out of the success of Amistad Academy, a charter school in New Haven that was founded in 1999. Achievement First now runs six schools in New Haven and Brooklyn. The other network is Uncommon Schools, which was started by a founder of North Star Academy in Newark along with principals from three acclaimed charter schools in Massachusetts; it now includes seven schools in Rochester, Newark and Brooklyn. The connections among the three networks are mostly informal, based on the friendships that bind Levin to Norman Atkins, the former journalist who founded North Star, and to Dacia Toll, the Rhodes scholar and Yale Law graduate who started Amistad with Doug McCurry, a former teacher. Toll and Atkins visited Levin at the Bronx KIPP Academy when they were setting up their original schools and studied the methods he was using; they later sent their principals to the leadership academy that Levin and Feinberg opened in 2000, and they have continued to model many of their practices on KIPP’s. Now the schools are beginning to formalize their ties. As they each expand their charters to include high schools, Levin, Toll and Atkins are working on a plan to bring students from all three networks together under one roof.

Students at both KIPP and Achievement First schools follow a system for classroom behavior invented by Levin and Feinberg called Slant, which instructs them to sit up, listen, ask questions, nod and track the speaker with their eyes. When I visited KIPP Academy last month, I was standing with Levin at the front of a music class of about 60 students, listening to him talk, when he suddenly interrupted himself and pointed at me. “Do you notice what he’s doing right now?” he asked the class.

They all called out at once, “Nodding!”

Levin’s contention is that Americans of a certain background learn these methods for taking in information early on and employ them instinctively. KIPP students, he says, need to be taught the methods explicitly. And so it is a little unnerving to stand at the front of a KIPP class; every eye is on you. When a student speaks, every head swivels to watch her. To anyone raised in the principles of progressive education, the uniformity and discipline in KIPP classrooms can be off-putting. But the kids I spoke to said they use the Slant method not because they fear they will be punished otherwise but because it works: it helps them to learn. (They may also like the feeling of having their classmates’ undivided attention when they ask or answer a question.) When Levin asked the music class to demonstrate the opposite of Slanting — “Give us the normal school look,” he said — the students, in unison, all started goofing off, staring into space and slouching. Middle-class Americans know intuitively that “good behavior” is mostly a game with established rules; the KIPP students seemed to be experiencing the pleasure of being let in on a joke.

Still, Levin says that the innovations a visitor to a KIPP school might notice first — the Slanting and the walls festooned with slogans and mottos (“Team Always Beats Individual,” “All of Us Will Learn”) and the orderly rows of students walking in the hallways — are not the only things contributing to the schools’ success. Equally important, he says, are less visible practices: clear and coherent goals for each class; teachers who work 15 to 16 hours a day; careful lesson planning; and a decade’s worth of techniques, tricks, games and chants designed to help vast amounts of information penetrate poorly educated brains very quickly.

Toll and Levin are influenced by the writings of a psychology professor from the University of Pennsylvania named Martin Seligman, the author of a series of books about positive psychology. Seligman, one of the first modern psychologists to study happiness, promotes a technique he calls learned optimism, and Toll and Levin consider it an essential part of the attitude they are trying to instill in their students. Last year, a graduate student of Seligman’s named Angela Duckworth published with Seligman a research paper that demonstrated a guiding principle of these charter schools: in many situations, attitude is just as important as ability. Duckworth studied 164 eighth-grade students in Philadelphia, tracking each child’s I.Q. as well as his or her score on a test that measured self-discipline and then correlating those two numbers with the student’s G.P.A. Surprisingly, she found that the self-discipline scores were a more accurate predictor of G.P.A. than the I.Q. scores by a factor of two. Duckworth’s paper connects with a new wave of research being done around the country showing that “noncognitive” abilities like self-control, adaptability, patience and openness — the kinds of qualities that middle-class parents pass on to their children every day, in all kinds of subtle and indirect ways — have a huge and measurable impact on a child’s future success.

Levin considers Duckworth’s work an indication of the practical side of the “character” education he and Toll and Atkins are engaged in: they want their students to be well behaved and hard-working and respectful because it’s a good way to live but also because the evidence is clear that people who act that way get higher marks in school and better jobs after school. To Toll, a solid character is a basic building block of her students’ education. “I think we have to teach work ethic in the same way we have to teach adding fractions with unlike denominators,” she told me. “But once children have got the work ethic and the commitment to others and to education down, it’s actually pretty easy to teach them. ”