An important challenge is that a majority of countries still lack a complete civil registration system with good attribution of cause of death, making it challenging to assess accurately the extent of progress towards MDG 5. Accordingly, the Maternal Mortality Estimation Inter-Agency Group (MMEIG), comprising the World Health Organization (WHO), the United Nations Children’s Fund (UNICEF), the United Nations Population Fund (UNFPA), the United Nations Population Division (UNPD) and The World Bank, together with a team at the University of California at Berkeley, United States of America, have been working together to generate internationally comparable MMR estimates. A technical advisory group (TAG) provides independent technical advice. The estimates.