The French Committee for Open Science (CoSO) was formed as a result of the National Plan for Open Science presented by Frederique Vidal, the Higher Education, Research and Innovation Minister on July 4th 2018, to the annual conference of the League of European Research Libraries (LIBER). The Committee wrote recommendations for the benefit of researchers and institutions, to foster open identifiers for open science. A large number of identifiers coexist. Good practice guides and action plans are being developed at the international level. The CoSO is defining a strategy to develop and adopt these identifiers with an objective of openness.