Description: This report presents the methodology and lessons learned from a climate change adaptation study conducted under the Greater Mekong Subregion (GMS) Core Environment Program. The study yielded a framework and methodology for assessing climate vulnerability and adaptation options for rural communities in the GMS. It was conducted in biodiversity conservation corridors in the Lao People?s Democratic Republic, Thailand, and Viet Nam during 2011?2012. The report introduces the framework, describes how it was applied, presents major results, and makes recommendations for future improvement... Recommendations: This study contributes to building understanding of the risks that Greater Mekong Subregion rural communities face with changing climatic conditions and of appropriate adaptation options. Lessons from this study can inform future research. The following eight recommendations suggest ways in which the study approach and methodology can be improved and scaled up. * Strengthen socioeconomic analyses * Apply multiple climate scenarios * Integrate community-based adaptation and ecosystem-based adaptation approaches * Improve participatory approaches * Integrate site specific crop model simulations where possible * Integrate an economic analysis * Analyze the broader policy and planning environment * Upscale to regional studies... Contents: Executive Summary; Introduction; Agriculture, Rural Communities, and Climate Change in the GMS Study Sites; Framework for Assessing Climate Change Vulnerability and Adaptation in Rural Communities; Synthesis of Study Results; Recommendations; Next Steps; Appendixes.