Water resources around the world are under increasing pressure. As a result, the services these water resources provide become increasingly scarce. In WERG, we study the relationship between human behavior and water use in different socio-economic activities (agriculture, recreation, water treatment, industry, hydropower, forestry). Water is considered a source and a sink, and we address, where possible, challenges in water quantity and water quality management in a holistic manner. The group is multidisciplinary, and consists of economists, engineers and scientists. Group members specialize in the development and application of hydro-economic models, non-market valuation methods, and the design and evaluation of water policy instruments. Most of the work is problem-driven and aimed at developing policy-relevant integrated decision-support tools based on cost-effectiveness and cost-benefit analysis.