This chapter explores group decision-making in territorial governance, with a focus on stakeholder participation in transport infrastructure planning. It examines the challenges of reconciling individual and collective preferences, emphasising the complexities of multi-stakeholder decision processes. Using Social Choice Theory and Social Welfare Functions as a basis, the chapter analyses mechanisms for aggregating diverse preferences into collective decisions,addressing the conflicts that are inherent in infrastructure planning. Multi-Criteria Analysis (MCA) methods are discussed as tools to structure decision-making processes and facilitate consensus. Integrating political, economic, and social considerations, enhances this framework ability to ptomote participatory governance and ensure more balanced and inclusive decision-making in sustainable transport development.