Susana Carreira is an associate professor in the mathematics department of the Faculty of Sciences and Technology at the University of Algarve. Keith Jones is an associate professor in the School of Education at the University of Southampton. Nelia Amado is an assistant professor in the mathematics department of the Faculty of Sciences and Technology at the University of Algarve. Helia Jacinto is a PhD student at the research unit of the Institute of Education of the University of Lisbon & Jose Saramago Middle School. Sandra Nobre is a PhD student and mathematics teacher, associated with the research unit of the Institute of Education of the University of Lisbon & Schools group of Paula Nogueira, Olhao, Portugal.