Closing the academic achievement gap is one of the most complex challenges that school system leaders face. Closing the gap became even more urgent with the enactment of the No Child Left Behind Act. For the first time, the federal government has set a deadline for closing the gap, requiring schools to bring all students to proficient levels of academic performance in twelve years. How much of the achievement gap can be attributed to what school districts themselves may be doing? What factors and conditions impede progress toward closing the achievement gap? And what can superintendents do to...