In a context where education funding is stagnating and even declining, Arran Hamilton and John Hattie suggest that we need to start thinking Lean and explicitly look for ways of unlocking more from less.

Dr Arran Hamilton is Group Director of Education at Cognition Education. Previously, he has held senior positions at Cambridge University Press & Assessment (formerly Cambridge Assessment), Education Development Trust, the British Council, and a research fellowship at Warwick University.

Professor John Hattie is Emeritus Laureate Professor at the Melbourne Graduate School of Education at the University of Melbourne, co-Director of the Hattie Family Foundation, and chair of the Board of the Australian Institute for Teaching and School Leadership.

Foreword by Sir Michael Barber Introduction Part One: Scene Setting 1. The Global Massification of Education 2. We Need to Get Lean 3. Reviewing the Existing Research on 'what works best' for Education in Developing Countries 4. The Visible Learning METAX Stop-gap Part Two: Warm Leads and Blind Alleys 5. Returns from Teacher Selection and Training 6. Returns from Structural Enhancements to School Systems 7. Returns from Teacher Accountability and Motivation Enhancement 8. Returns from High Impact Teaching and Learning Approaches 9. Returns from Education Technology Part Three: Evidence into Action 10. From Provocation to Implementation 11. Leaning to G.O.L.D. 12. Conclusions Appendix: High-Level Summary of 57 Developing Country 'what works best' for Education Systematic Reviews