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Decisions on sustainable development issues usually involve multiple stakeholders with multiple and often conflicting perspectives. Participatory processes along with sound multicriteria analysis tools and models for cooperative group decision-making can support stakeholders to select the best actions. This article presents a real-world application of the MACBETH socio-technical approach for the sustainable redevelopment of a brownfield. The project is aimed at presenting a visible and high-profile participation process that could trigger a domino effect for other mine brownfield redevelopment projects to follow in Portugal. A group of key stakeholders was chosen to represent the main evaluation perspectives of the decision context. Structuring the problem was carried out during a decision conference. As it was not possible to apply a full decision conferencing procedure, we conducted at distance a novel …