Marianna Bosch is Professor at Universitat Ramon Llull, Spain. She is an experienced researcher in ATD with a long involvement in the dissemination of research to the international audience. Yves Chevallard is Professor Emeritus at Aix-Marseille Université, France and the main developer of ATD. Francisco Javier García is a researcher and lectuerer at Universidad de Jaén, Spain. John Monaghan is Emeritus Professor at the University of Leeds, UK and Professor at the University of Agder, Norway.