Despite substantial progress over the last two decades, girls still have on average lower levels of educational attainment than boys in West and Central Africa. This is in part because many girls in the region are married while still children, often before they may be physically and emotionally ready to become wives and mothers. Educating girls and ending child marriage is essential for girls and young women to have agency, not only as wives and mothers, but also beyond those roles. It is also essential to enable countries to reach their full development potential. This note provides a rapid summary of a first set of eight notes in this series on girls' education and child marriage in West and Central Africa. The eight notes were prepared ahead of the High Level Meeting on Ending Child Marriage in West and Central Africa held in Dakar on October 23-25, 2017. Several notes in this first set look at the economic impacts of girls' education and child marriage on a range of other development outcomes.