The journey from the Elementary and Secondary Education Act (ESEA) to the Every Student Succeeds Act (ESSA) highlights a nuanced evolution in educational accountability. Initially, ESEA focused on federal oversight and funding to support disadvantaged students, introducing standardized testing as a metric for measuring school performance and accountability. ESSA, implemented in 2015, introduced a more flexible approach, granting states greater autonomy in defining and assessing school and student success. It emphasizes broader measures of accountability, including academic proficiency, student engagement, and school climate, aiming to provide a more comprehensive view of educational effectiveness. Challenges in navigating this transition include balancing federal mandates with state flexibility, addressing disparities in educational outcomes, and ensuring accountability measures are equitable and inclusive. ESSA’s framework reflects ongoing efforts to adapt educational policy to diverse student needs while maintaining standards that promote educational equity and excellence across the United States.