RATIONALE "Sycara, negotiation" K. P. Sycara, Cooperative Negotiation in Concurrent Engineering Design. In: Computer-Aided Cooperative Product Development, (Eds) D. Sriram & R. Logcher, Springer-Verlag, 1991, pp. 269-297. This work provides another way to handle conflicts (failures) between agents in a multi-agent design system, using negotiation. While research on negotiation has progressed a lot, this paper gives an outline of how two agents might negotiate, using a case-based approach. It also introduces the idea of having simple models of other agents' beliefs about design goals (e.g., make it strong) and their relationships (e.g., improving A also improves B).