In many decision-making contexts, choice is taken not by isolated individuals but is rather the result of a process of interaction among many incumbents. "Deliberative Agreement" intends to explore and analyze those situations where a decision is made by a group of individuals in the context of multiagent systems and distributed computing. The overall goal of our ongoing research is to analyze properties and develop mechanisms for collective decision making in human and artificial agents. The focus will be on tasks that require complex agreements, i.e. involving at least one of the following: (i) argumentation processes for deliberation, (ii) aggregation of sets of interconnected judgments.