In 2009 Professor John Hattie published Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement. This groundbreaking book synthesized the findings from 800 meta-analysis of 50,000 research studies involving more than 150 million students and it built a story about the power of teachers and of feedback, and constructed a model of learning and understanding by pointing out what works best in improving student learning outcomes.
Since then, John Hattie has continued to collect and aggregate meta-analyses to the Visible Learning database. His latest dataset synthesizes more than 1,600 meta-analyses of more than 95,000 studies involving more than 300 million students. This is the world’s largest evidence base into what works best in schools to improve learning.
Download the full 250+ Influences Chart here.