What has the largest effect on student learning?
(from 500 000 studies)
Prof John Hattie, Faculty of Education, The University of Auckland
Effect size of 1 corresponds to one standard deviation unit
| Influence | Effect Size | Source of Influence |
| Feedback | 1.13 | Teacher |
| Students prior cognitive ability | 1.04 | Student |
| Instructional quality | 1.00 | Teacher |
| Direct instruction | 0.82 | Teacher |
| Remediation/feedback | 0.65 | Teacher |
| Students disposition to learn | 0.61 | Student |
| Class environment | 0.56 | Teacher |
| Challenge of goals | 0.52 | Teacher |
| Peer tutoring | 0.50 | Teacher |
| Mastery learning | 0.50 | Teacher |