This third Symposium will build on the review and analysis of transboundary basins and aquifer management issues that occurred at the previous symposiums in November 2002 in Monterrey (Mexico), and November 2004 in Tucson (USA). Topics ranging from quantity and water quality management, impacts of climate fluctuations, building flexibility and robustness into compacts, and improved sharing of data will be considered. Market-based allocation approaches, ecological conservation, and the need for greater hydrologic literacy among decision-makers also will be included, in view of their relevance in the international and interstate water resources arena.