This Knowledge Product (KP) will provide practical advice for stakeholders involved in designing and implementing robust and integrated national MRV systems for NDCs in developing countries. The differences between developing NDC related MRV systems bottom-up (e.g. for mitigation actions) and top-down (e.g. national MRV system) will be described. The main discussion is about what to consider for linking both approaches and develop a “linked MRV system”.