Abstract: Mathematical discussion is an essential formative moment in classroom practices for developing skills related to the meaning of mathematics education: understanding why things work, posing and solving problems, developing critical arguments. In the digital age, introducing mathematical discussions into the classroom presents new challenges: selecting “good” mathematical problems, integrating digital tools, and fostering students’ participation and inclusion. In this talk, I would like to share the results of some studies and projects I have collaborated on, which focus on mathematical discussion in secondary school. After providing an overview of the various teaching configurations connoting mathematical discussions, I will focus on the role of digital tools and the teacher's didactic performance in supporting meaningful mathematical discussions.