The new paradigm of “knowledge construction using experiential based and collaborative learning approaches” is an outstanding opportunity for interdisciplinary research. This document is an attempt to introduce and exemplify as much as possible using the lexicon of “social sciences”, considerations and tools belonging to “artificial intelligence”. In the paper we first draw a conceptual framework for rational agents in conversational interaction; then we use this framework for describing the processes of co-building ontologies, co-building theories, social interactive learning … as examples of constructive interactions; finally we give a brief description of a conversational protocol aimed at putting a stone in the middle of the gap between human conversation and calculus.