The choice of the offer to propose at a given step in a negotiation dialogue is a strategic matter and depends broadly on the profile of the agent and its mental states. The aim of this paper is to propose some negotiation strategies which are based not only on the goals of the agents but also on their rejections. A three-layered setting is proposed for defining and analyzing strategies. Categories and Subject Descriptors I.2.11 [Distributed Artificial Intelligence]: Intelligent agents General Terms Human Factors, Theory Keywords Negotiation, Strategies