Editorial remarks.-- Open discussion: Study on the cooperation treaties and agreements between Latin American and Caribbean countries on transboundary water systems and bodies of water ; Interesting experiences in Costa Rica: the water rate and the environmental tax on discharges.-- News of the Network: REGA, Water Management Magazine ; South American Technical Advisory Committee (SAMTAC).-- Meetings: Seminar "An integrated approach for sustainable water management. Experiences in water management and valuation".-- Internet and WWW news