The transition from the Elementary and Secondary Education Act (ESEA) to the Every Student Succeeds Act (ESSA) marks a pivotal shift in U.S. education policy. ESEA, enacted in 1965, focused on providing federal funding to improve educational opportunities for disadvantaged students and introduced measures for accountability through standardized testing.ESSA, passed in 2015, retains the core accountability principles but grants more flexibility to states in defining and assessing student and school performance. It emphasizes a holistic approach to evaluating school success, including factors beyond test scores, such as student engagement and school climate.Challenges in this evolution include balancing federal oversight with state autonomy, addressing disparities in educational quality, and ensuring accountability measures reflect diverse student needs. ESSA's implementation reflects ongoing efforts to refine accountability frameworks and promote equity in educational outcomes, adapting federal policy to better support schools and students in achieving academic success and overall well-being.