Water scarcity or surplus, or pollution are a big problem in the world and MSM has expertise in the field of Water and sanitation issues: adaptive water management, polluted water and the consequences of climate change. Sectorally we have looked at water for agriculture, urban water and the issues of too much or too little water. Water governance problems are prominent in many countries and require another approach to water issues, involving stakeholders and using their resources. An important field is also the economics of water, where the cost and benefits of different solutions are calculated and the tariffs are fixed in such a way that they allow a sustainable use of this resource. Finally, the issue of water has led to a big debate on the role of the government in this field and the possible contribution of the private and NGO sector.