Christopher Chapman is Director of the Robert Owen Centre for Educational Change and Professor of Educational Policy and Practice at the University of Glasgow, UK. Daniel Muijs is Professor of Education at the University of Southampton, UK. David Reynolds is Professor of Educational Effectiveness at the University of Southampton, UK. Pam Sammons is Professorial Senior Research Fellow in the Department of Education at the University of Oxford, UK. Charles Teddlie is the Jo Ellen Levy Yates Professor of Education, Emeritus, at Louisiana State University, USA.