1. Department of Integrated Didactics, University of Huelva, Huelva, Spain
2. School of Physics and Mathematics, Meritorious University of Puebla, Puebla, Mexico
3. Faculty of Livestock Sciences, State Technical University of Quevedo, Quevedo, Ecuador
4. School of Education, Catholic University of the North, Antofagasta, Chile
5. Department of Didactics of Mathematics, University of Granada, Granada, Spain
6. Department of Statistics and Operative Investigation and Didactics of Mathematics, University of Oviedo, Oviedo, Spain
7. Department of Education and Cultural Practices, State University of Campinas, Campinas, Brazil
8. Department of Didactics of Mathematics, University of Seville, Seville, Spain