Viet Nam is one of the world's sixteen most biologically diverse countries. Over 50,000 species have been identified, consisting of nearly 7,500 microorganisms, 20,000 terrestrial and water plants, 10,500 terrestrial animals, 2,000 invertebrates and freshwater fish, and over 11,000 marine species. Although biodiversity brings direct benefits to humans, contributes to the national sustainable development strategy, and protects the environment, Viet Nam is experiencing rapid biodiversity loss due to population growth, over exploitation of natural resources, illegal logging, and the expansion and intensification of agriculture; Illegal wildlife trade and infrastructure development. In this context, WWF-Viet Nam is looking for a respective professional service provider to provide science-based research on assessing the drivers of biodiversity decline in Viet Nam due to the impacts of economic development. Detailed Request for Proposals and Terms of Reference of the Assignment is attached.