The DAFNE project develops decision-analytic frameworks and visualization tools to analyze the complex water-energy-food nexus in transboundary contexts in fast-growing countries. The project focuses on the Omo-Turkana basin in Ethiopia and the Zambezi basin in Zambia. The frameworks include models to analyze impacts of policies under different future scenarios, identify trade-offs between sectors, and facilitate stakeholder negotiations. Multi-perspective visualization tools allow analyzing results and exploring different perspectives. The tools aim to support sustainable policymaking through comparative analysis and understanding different stakeholder needs.