This case study describes efforts by Rainforest Alliance to meet growing industry demand for certified cocoa by rapidly scaling up its network of certified farmers in the cocoa-producing countries of Ghana and Côte d’Ivoire. A key focus of the paper is on reaching unorganised farmers, as the vast majority of West African cocoa farmers do not belong to co-operatives. By working through supply chain companies and trader networks, Rainforest Alliance was able to certify over 15,000 farmers in just three years. At the same time, the team explored new ways to reduce costs to farmers and to increase farmer benefits.