A new analysis shows not only the extent of segregation in New York City, but also that the achievement gap is just as strong even at most “integrated” schools. Success Academy schools defy the demographic trend. The network’s diverse Cobble Hill school, for example, has only a tiny achievement gap. As one report co-author, Nicole Mader, put it, while Success’ “income gaps are some of the widest . . . their test score gaps are among the smallest.”