'Professor John Hattie found that Feedback has more effect on achievement than any other factor. Professors Paul Black and Dylan Wiliam of Kings College London spent four years studying and reviewing research into feedback which is closely linked to 'formative assessment'. They concluded in agreement with Professor Hattie that formative assessment has a huge effect on learning quality. It has been found to add the equivalent of two grades to students' achievement if done very well.'
Extract from Teaching Today, Geoff Petty
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