The document details the collective scientific expertise (ESCO) process at the French National Institute for Agricultural Research (INRA), established in 2002 to provide scientific assessments for decision-making related to societal debates. It describes the methodology, including the selection of multidisciplinary experts, the process of information gathering, and the creation of comprehensive reports, particularly focusing on the intersection of agriculture and biodiversity. The outcomes of ESCO aim to influence national and international agricultural policies while ensuring the credibility and integrity of the scientific assessments conducted.