The ex-ante assessment of feasibility, value-for-money, and risk is a critical step in ensuring the effectiveness of Public-Private Partnerships (PPPs), especially in complex contexts. This paper proposes an operational framework to support decision-makers in conducting such assessments by combining analytical tools with a practice-oriented managerial approach. Drawing on the “Strategy as Practice” perspective, the study highlights how the evaluation process is not merely technical, but also relational and negotiated, shaped by the interactions between institutional and private actors. Within this context, the financial promodel is reinterpreted as a platform for dialogue and co-production, fostering transparency, interest alignment, and shared value creation. The sustainability of the partnership thus results from the integration of financial and economic rationality with collaborative capacity, enhancing both the legitimacy and the impact of public decision-making.