This manual has been produced as part of the Coastal Habitats and Resources Management (CHARM) project. This project was funded jointly by the EU (European Union) and DoF (Department of Fisheries; Royal Thai Government) and implemented from 2002-2007 in Thailand. One component of this project was the development and implementation of Community Based Monitoring (CBM). This manual describes the framework of CBM and provides practical advice on the implementation of CBM in coastal areas. This manual is designed for governmental, non-governmental organisations or community-leaders who are interested in using the CBM approach.