The document summarizes an assessment of the impacts and effectiveness of the CLISP Transnational Strategy for Climate-Proof Spatial Planning (CLISP TPS). The CLISP TPS aimed to provide integrated, cross-border recommendations and proposals for climate change adaptation through spatial planning. However, it lacked a mechanism for ongoing implementation and faced challenges in effectively bridging science and practice. While the CLISP TPS raised awareness and was used indirectly by some countries and regions, its overall transnational impacts were limited without a responsible body for spatial planning or follow up process. Key lessons included the need to directly engage policymakers, provide more localized information, and establish ownership and commitment to ongoing knowledge development after project