Editorial remarks.-- Open discussion: Regulatory accounting for drinking water supply and sanitation services ; A new regulatory model in Bolivia.-- News of the Network: Mexico: The Water Decalogue ; Peru: Guidelines for the Extraordinary Review of Rate Formulas ; Chile: Proposal for an integrated river basin management model ; ADERASA: Benchmarking of water supply and sanitation companies in the Americas ; Chile: Proposal for new constitutional water regulation.-- Meetings: Economically Efficient, Environmentally Sustainable and Socially Equitable Services ; Technical Workshop on Compiling Water Accounts in Latin America ; International Investment Agreements and Sustainability of Infrastructure Investments.-- Courses: Environment, natural resources and energy.-- Internet and WWW News