Over the last ten years, interest in argumentation has expanded dramatically, driven in part by theoretical advances but also by successful demonstrations of a wide range of practical applications. DYNAR aims at developping an abstract theory of the dynamics of argumentation theory in which arguments/conflict relations can be added/removed. Furthermore, a framework for aggregation of argumentation frameworks for interaction among arguing agents will be studied, and applied to dialogues between agents. All teams will work on the abstract theory, the CRIL team on merging networks, the Luxembourg team on argumentation based judgment aggregation and its relation to belief merging. All teams will work on the implications for dialogues among agents in their areas of interest.