The creation of an international institution is a rare fact. In 2012, IPBES, the Intergovernmental Science/Policy Platform on Biodiversity and Ecosystem Services, was officially established. This event is a continuation of the introduction to the political and scientific agenda of biodiversity launched in the 1980s and marked by the signing in 1992 of the Convention on Biological Diversity and the publication of the Millennium Ecosystem Assessment in 2005. The IPBES, which was discussed in 2005, marks the desire to bridge a gap between science and politics, which is believed to be at the root of the failure of international governance in the face of the threat of a 6th extinction of species. This book examines the IPBES training period (2005-2012), which is characterised by radical uncertainty as to its contours and very existence. Combining ethnography, sociology of documentary and socio-informatics practices, the authors take a pragmatic approach geared to the way in which this institution is now living in many scenes. The book describes how it is made visible on the web, monitors its relations with pre-existing institutions, highlights the role of its documentary archives, captures the performance of negotiators face-to-face and discussions on the formulation of the founding texts. The subject of multiple, sometimes contradictory, knowledge and appropriations, biodiversity is at the heart of political demands. How could the negotiations lead to a successful conclusion, beyond the variety of views and strategies of the different players? How have scientific communities, states, international bodies and environmental causes been able to overcome cognitive and political disagreements and dissonance? Through its hermeneutical of an institution in training, the book helps to put into perspective the idea of an irrevocable divide, often denounced, between international diplomacy and actors on the ground.