These Guidelines and accompanying materials have been prepared to support national statistical offices, ministries of health, and other relevant government and non-government agencies to better estimate the completeness of civil registration and vital statistics (CRVS) systems, in particular, the completeness of birth and death registration. This was in response to findings from the mid-term review and accompanying technical report of progress, which showed that despite significant progress made by countries in the region, one of the challenges that remains is countries’ capacity to evaluate the completeness of their civil registration systems.