We will need to produce more, with less water. To ensure water is managed well in an increasing complex environment, common rules, practices, and processes need to be in place and strengthened. The OECD has compiled 12 principles for water governance: 4 linked Effectiveness , 4 to Efficiency, and 4 to Trust and Engagement. In this short and clear report, the reasoning behind the principles is explained. It is easy to read for both policy makers and engineers and forms a strong framework for strengthening and understanding governance. The overview of the principles can be found on page 4.