This publication forms part of a series of NDC sectoral overviews, which provide information about current sectoral contributions to global greenhouse gas emissions and prospects for implementing NDCs in these sectors. This briefing paper discusses transparency and measurement, reporting and verification (MRV) in the NDC context. MRV serves to enhance the transparency of climate change actions, as well as clarify information about support that has been provided and received. MRV in this case refers to all measures that countries take to collect data on greenhouse gas emissions, mitigation actions and support, their efforts to compile this information in reports and inventories, and to subject these to review or analysis.