This report describes the REDD+ Opportunities Scoping Exercise (ROSE) methodology, and summarises the experience of developing and using it in three case study countries – Tanzania, Uganda and Ghana. ROSE is a tool for classifying and prioritizing potential REDD+ sub-national activities, and for assessing critical constraints to project development, especially those associated with the legal, political, and institutional framework for ‘terrestrial’ carbon finance. The ROSE tool is therefore relevant to REDD+ at both the sub-national and national levels.