During the last years, manufacturing and service industries faced a global change in the production paradigm. Besides the manufactured products, companies also focus their attention on business services that can add value to their products, which often need to be provided by different entities, offering different competences/services that collaborate to achieve a service-enhanced product. In this context, the collaborative process of design and/or creation of new business services can also be improved if supported by a negotiation environment that facilitates the interaction among the various involved entities, and the process of modeling and reaching agreements. For that, this paper presents a support system for service co-design negotiation that facilitates the design of new business services under a collaborative perspective.