By the end of fourth grade, African American and Latino students, are two years behind their wealthier, predominantly white peers in reading and math. By eighth grade, they have slipped three years behind, and by 12th grade, the gap is full four years. These are just two examples of the most alarming figures that threaten the educational equity of…

To many, it seems obvious which schools are failing--schools whose students perform poorly on achievement tests. But since evaluating schools on achievement mixes the effects of school and nonschool influences, achievement-based evaluation likely underestimates the effectiveness of schools that serve disadvantaged populations. In this article, the…