The aim of this guidebook is to help those who work, or are beginning to work with MRV in climate change issues to gain an overview of the foundations of MRV under the Convention. As such, our approach is has been to objectively organize and present information drawn from UNFCCC decisions and guidelines developed by the COP related to MRV by developed and developing countries, as well as a few specific cases where outside resources are referenced to complement these sources. As much as possible, COP decisions and guidelines are referenced to facilitate follow-up by the user.