Finland transformed its education system from one that was poorly ranked and inequitable in the 1970s to the top-ranked system in the world today. Key to Finland's success was investing heavily in teacher education, decentralizing control to give teachers more autonomy over curriculum, and focusing on equity and meeting student needs rather than standardized testing. Finland ensured all students have access to well-trained teachers, funding, resources, small class sizes, and a curriculum focused on developing higher-order thinking skills. This has created a highly equitable and successful education system.