The document summarizes CIFOR's Global Comparative Study on REDD+ (GCS-REDD+). The study aims to support REDD+ policy and practice with science-based information, analysis, and tools to help ensure REDD+ outcomes are effective, efficient, and equitable. The GCS-REDD+ structure involves policy analysis of 12 countries since 2009 and project analysis of 6 countries with 23 REDD+ project sites across 190 villages and 4,524 households. Key modules examine REDD+ strategies, project sites, monitoring and reference levels, and carbon management at landscape scales. Results are disseminated through publications, trainings, and workshops to influence REDD+ policies, strategies, and practices.