Over 200 million households in sub-Saharan Africa (SSA) depend on maize for food security and their well-being, yet maize yields in this region are very low compared to other parts of the world. Maize farmers face drought and other climate stresses, emerging pests and diseases, low soil fertility. The slow adoption of new stress tolerant varieties means farmers are unable to reach their yield potential. The STMA project funded by the Bill & Melinda Gates Foundation and the United States Agency for International Development (USAID) aims to develop in a cost-effective way multiple stress tolerant varieties, and through partnerships with local public and private seed sector, make these improved seeds available at scale in SSA. The project is in its third year of implementation and it is implemented in partnership with seed companies (private and public) and extension services providers to foster equal participation of men and women in varietal trials.