Editorial remarks.-- Open duscussion: Urban drinking water supply and sewerage services in Chile: determining factors of performance ; River basin organizations: lessons from recent experiences ; Liquid biofuels: policymaking elements.-- News of the Network: The right of children and adolescents to a healthy environment ; New norms for the drinking water supply and sanitation sector in Peru ; National Water Resources Policy in Panama.-- Meetings: Challenges of conservation and energy agendas in protected areas ; Testing the economic elements of the European Water Framework Directive in river basins of the TWINLATIN project.-- Internet and WWW News