International Development Enterprise (iDE) focuses on developing market systems to serve the needs of the poor in developing countries. For more than eight years in Cambodia, Vietnam, Timor Leste, Laos, and now in Nepal and Bangladesh, iDE has been a pioneer in the application of market-based approaches to improve household water treatment, sanitation and hand washing (WASH) in rural areas. iDE’s approach exploits the comparative advantages of the private-sector, government, and NGOs to reach large numbers of poor households in short time frames.