This axis is devoted to questions relating to plurilingualism in its cognitive and individual aspects as well as in its social and educational aspects.

It is divided into 6 transversal themes:

1. Development of the plurilingual subject
2. Charters and languages
​​3. Languages ​​in contact
4. Francophonie as a global workshop
5. Multilingual societies
6. The multilingual school

Disciplines involved: language teaching ( multilingualism, French-speaking ), interactional linguistics, formal linguistics, neurolinguistics, cognitive psychology, psycholinguistics, educational sciences, sociolinguistics, constitutional law, European law, etc.