Collaborative design is a collection of the co-operated efforts undertaken by a team of designers. Due to multi-actors interaction, conflicts can emerge from disagreements between designers about proposed designs. Therefore, a critical element of collaborative design would be conflict resolution. In this paper, the DEPNET methodology is introduced to support conflict management. This methodology is based on a Unified Modelling Language (UML) traceability model to extract the data dependencies network. This will allow identifying the conflict resolution team as well as evaluating the impact of a selected solution. A case study within an industrial partner is described to illustrate this methodology.