This publication is the result of the participation of 26 experts involved in the management of freshwater resources from Africa, Europe, North and South America, Asia and Oceania. Their experiences on the causes and possible ways to prevent eutrophication have been assembled here. While this publication is not intended to be a technical manual on how to prevent or solve the problem of eutrophication, it does provide a comprehensive view of the essential components and processes to address the issue effectively.