NetMark is an eight-year project funded by the United States Agency for International Development (USAID) to prevent malaria by increasing access to and use of ITNs in sub-Saharan Africa. NetMark began in 1999 and addresses all three components of the Roll Back Malaria Strategic Framework for Scaling-up of ITNs: commercial expansion, short-term targeted subsidies or market priming activities, and long-term targeted subsidies to vulnerable groups in order to achieve equity. NetMark aims both to develop a sustainable commercial market and to ensure that vulnerable groups have access to affordable ITNs. In addition to increasing the proportion of households that own ITNs, the project also seeks to increase nightly use of treated nets, especially by pregnant women and children under five years of age; and to increase the proportion of net owners who, if not using a long-lasting ITN, regularly treat their nets with insecticide.