Glennerster); Development Media International, or DMI ( Murray); University of Oxford ( Pouliquen) "The structure of the campaign - with frequent messages over 2.5 years and the focus on engaging programming - was well adapted to influence behavior through this mechanism." In 2014, only 16% of women of childbearing age in Burkina Faso used modern methods of contraception, and the average woman gave birth to six children over her lifetime. High fertility rates and short spacing between births are both associated with poor health outcomes for women, but social norms and lack of (or mis)information can discourage contraceptive use. Mass media campaigns have potential to provide information on the benefits and logistics of family planning and influence social norms at low cost. This two-level randomised controlled trial (RCT) assessed the effectiveness of a 2.5-year mass media campaign implemented by Development Media International (DMI) to increase modern contraceptive uptake in Burkina Faso. The Abdul Latif Jameel Poverty Action Lab (J-PAL) and Innovations for Poverty Action (IPA) were partners in evaluating the intervention, which was funded by the Global Innovation Fund (GIF), Development Innovation Ventures (DIV), and a private philanthropist.