C. Sorsana, Introduction. C. Sorsana, Peers' Verbal Interactions Specificity on Cognitive Development. V. Tartas, A.N. Perret-Clermont, Socio-cognitive Dynamics in Dyadic Interaction: How Do You Work Together to Solve Kohs Cubes? I. Olry-Louis, I. Soidet, Collaborative Writing Devices, Types of Cooperation, and Individual Acquisitions. J.P. Roux, An Interlocutory Analysis as a Methodological Approach in Studying Cognitivo-linguistic Mediations: Interest, Difficulties, Limits… A.Trognon, C. Sorsana, M. Batt, D. Longin, Peer Interaction and Problem Solving: One Example of a Logical-discursive Analysis of a Process of Joint Decision Making.