The 1980s saw considerable progress in development and application of low-cost water-supply and sanitation technology. Agenda 21 envisages continuation of this work, with particular emphasis on development of appropriate sanitation and waste disposal technologies for low-income high-density urban settlements.
This strategy features in the framework of Agenda 21 as formulated at UNCED (Rio de Janeiro, 1992), now coordinated by the United Nations Commission on Sustainable Development and implemented through national and local authorities. Agenda 21 recommends implementation of water, sanitation and waste management programmes focused on the urban poor.