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The importance of negotiation has increased in the last years as a relevant interaction tosolve conflicts in multi-agent systems. Although there are many dierent scenarios, a typicalnegotiating situation involves two cooperative agents that cannot reach their goals by themselvesbecause they do not have some resources needed to reach such goals. Therefore, a way toimprove their mutual benet is to start a negotiation dialogue, taking into account that theymight have incomplete or incorrect beliefs about the other agent´s goals and resources. Theexchange of arguments during the negotiation gives them information that makes it possibleto update their beliefs and consequently they can oer proposals which are closer for reachinga deal. In order to formalize their proposals in a negotiation setting, the agents must be ableto generate, select and evaluate arguments associated with such oers, updating their mentalstate accordingly.We situate our work on this kind of scenarios with two argumentation-basednegotiation agents equipped with belief revision operations in the generation and interpretationof arguments. It has been proved that those agents that take advantage of belief revisionduring the negotiation achieve an overall better performance. Because the belief revision processdepends on the information the agents exchange in their utterances, in this paper wefocus on dierent communication strategies the agents may implement and the impact thatthey have in the negotiation process. For this purpose, we present a negotiation protocol wherethe messages are extended to include a critique to the last proposal received and a counterproposal.Also, we define proposals that may be more or less informative containing dierentjustications. An intentional agent architecture is proposed and following this model dierentkind of negotiating agents are created using diverse communication strategies. To assessthe impact these strategies have in the negotiation process some simulations are conducted,analyzing the results obtained.