Evaluating the temporal value of infrastructure projects requires a structured decision-making framework that considers the views of various stakeholder. This chapter examines the role of the Working Group as a central mechanism in the proposed evaluation model, which facilitates stakeholder engagement across multiple territorial levels. Comprising of institutional and managerial entities, the group ensures a balanced approach to decision-making by aligning public administration objectives with private sector interests. The model emphasizing multi-level governance and incorporates mechanisms for conflict resolution and preference aggregation, fostering a nuanced synthesis of stakeholder perspectives. This methodological approach enhances the transparency and effectivenessof decision-making, ensuring that infrastructure projects meet regulatory, economic, and social sustainability criteria.