This project provided an independent analysis to the WCPFC Commission and the relevant subsidiary bodies on the issues surrounding the use and monitoring of FADs deployed and encountered in the WCPO. In particular, the project examined available information on FAD numbers, density and distribution, current patterns of deployment, types and nature of FADs and tracking buoys used, with a view to evaluating the need and viability of a common marking system for FADs deployed / encountered in the WCPO. The project identified a number of possible options for marking systems, as well providing as a cost-benefit analysis of each.