Biodiversity Research Methods is the product of tremendous international and interdisciplinary cooperation in the IBOY-DIWPA program. IBOY-DIWPA"s aims are to establish baseline inventories of biodiversity through an international network of study sites of different ecosystems. Developed from extensive preliminary research conducted for IBOY (International Biodiversity Observation Year) throughout the western Pacific and Asian regions, this manual includes detailed research methodologies for forests and freshwater and marine environments, with the aim of ensuring that the results of biodiversity research at different study sites are meaningfully comparable, thereby enhancing our understanding of biodiversity distribution and its role in the ecosystem.