The No Child Left Behind Act of 2001 (NCLB) reauthorized the Elementary and Secondary Education Act of 1965 and aimed to improve educational equity and outcomes for students from lower-income families. NCLB required annual student testing, "adequate yearly progress" targets, and interventions for low-performing schools. Starting in 2011, the Department of Education offered waivers from some NCLB requirements in exchange for states adopting new academic standards and accountability systems. While waivers allowed flexibility, implementation has proved controversial.