Claire Mooney is an Instructor at the School of Education and Professional Learning, Trent University, Canada. Mary Briggs is an Associate Professor at the Institute of Education, University of Warwick where she teaches across a range of the Institute's undergraduate and postgraduate programmes. Mary was an Early Years, primary and SEN teacher for many years, including deputy and headship before working as an academic in the University sector. Alice Hansen is the Director of Children Count Ltd where she is educational consultant. Her work includes running professional development courses and events for teachers and teacher trainers, research and publishing. Alice has worked in education in England and abroad. Prior to her current work she was a primary mathematics tutor and the programme leader for a full-time primary PGCE programme at a large university in England. Judith McCullouch is a Senior Lecturer in Primary Mathematics Education and PGCE Programme Director at the University of Winchester. Mike Fletcher is a Lecturer in Mathematics Education at the Research and Graduate School of Education, University of Southampton.