What US federal law, passed in 2001, aimed to improve educational outcomes through standardized testing?

A landmark piece of federal legislation, enacted in 2002 but stemming from a bill passed in 2001, significantly reshaped American public education by introducing widespread accountability measures. This law, the No Child Left Behind Act (NCLB), aimed to improve educational outcomes for all students, with a particular focus on closing achievement gaps among different student subgroups, such as those from low-income families, students with disabilities, and various racial and ethnic minorities.

A core component of No Child Left Behind was its emphasis on standardized testing. The act mandated that states develop and administer annual standardized tests in reading and mathematics for students in grades 3 through 8 and once in high school. Schools were then required to demonstrate "Adequate Yearly Progress" (AYP) in these test scores, not just for the student body as a whole, but also for specific demographic subgroups. Failure to meet AYP targets could lead to increasingly severe sanctions for schools, ranging from requiring improvement plans to restructuring.

Beyond testing, the law also focused on ensuring "highly qualified" teachers in every classroom and providing parents with more choices, including the option to transfer their children from consistently underperforming schools. While NCLB succeeded in highlighting educational disparities and promoting a focus on accountability, it also faced criticism for its heavy reliance on standardized tests, which some argued led to a narrowing of the curriculum and a phenomenon known as "teaching to the test." It was ultimately replaced by the Every Student Succeeds Act (ESSA) in 2015, which granted states more flexibility in their accountability systems.