The Robson classification, also known as the 10-groups classification or ten groups classification system (TGCS), is a system for classifying pregnant women who undergo childbirth. It was developed to allow more accurate comparison of caesarean section rates between different settings, whether they be individual hospitals or entire regions or countries. Endorsed by the World Health Organization in 2015, it differs from other classification systems in that it accounts for all women who undergo delivery, and not just those who proceed to cesarean section.