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 1,400 meta-analyses of 93,000 studies involving more than 250 million students. This is the world’s largest evidence base into what works best in schools to improve learning.
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