The project, SUSTAIN_GOV, aims at investigating sustainable spatial development policies in the context of governance, both with respect to Luxembourg and, as a comparative ap-proach, to the Swiss planning system and urban transformation processes in the Glattal-Stadt. SUSTAIN_GOV builds directly from the strong conceptual and empirical foundations estab-lished by the “SUSTAINLUX Project” (CO9/SR/01) that has thus far shown that despite the intense urbanization pressure, the strong strains on land resources and infrastructure, and the political dilemmas these issues raise, policy, planning and governance practices in the Grand Duchy remain underdeveloped, particularly in the domain citizen involvement in public deci-sion-making. SUSTAIN_GOV brings into sharper focus a more nuanced scientific under-standing of participation, governance, and integrated sustainable spatial development, and an in-depth evaluation of existing spatial planning, policy, and governance patterns in the Grand Duchy. The proposed research is informed by a robust and contemporary set of conceptual approach, that shape current urban and regional literatures. The research design follows a qualitative methodological approach.