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The paper introduces restructurable modelling of negotiation aimed at supporting decision situations with an evolving structure. The theoretical framework of such models is presented by means of a rule-based formalism. This framework encompasses both qualitative and quantitative models, and the use of multiple procedures for solving the negotiation problem, adjusting the solution, and restructuring the problem representation. A hypothetical example of a house purchase is given to illustrate the discussion. The implications of the study for future directions of research on negotiation modelling and support are presented.