Collaborative processes are widely used to harness resources for addressing community problems. Despite their positive potential, collaborative projects can fragment. Sources of fragmentation include participant misperception of facts, difficulties in defining the problem, and misunderstandings among stakeholders. Disruptions from these elements may impede a group's progress in fostering and implementing agreements.Theoretical and empirical research from conflict resolution has shown that discussing participant interests and the use of facilitation techniques can help negotiators engage in innovative problem solving. Interests are participants' underlying needs, concerns, and desires that shape how individuals perceive issues and the stances they take. Less attention has been given to designing multi-party collaborative processes so that participant interests are explicitly defined and addressed. This comparative case study used mixed methods to examine the role of interests on the evolution of five successfully implemented multi-party collaborative cases. The research examined how participant interests were identified, how facilitation techniques were used, and how stakeholders'