Recent studies of charter school effectiveness have questioned whether charter school networks can produce a lasting impact on students' long-term outcomes. Our study is the first to examine this issue at the network of Knowledge is Power Program (KIPP) schools, which primarily serve disadvantaged students of color and constitute the nation's…

For decades, social theorists have posited--and descriptive accounts have shown--that students isolated by both social class and ethnicity suffer extreme deprivations that limit the effectiveness of equal-opportunity interventions. Even educational programs that yield positive results for moderately disadvantaged students may not prove beneficial…