The issue of Open Access (OA) in research is attracting growing interest both within the scientific community and on the political scene. Some centers specializing in the production of science indicators now include OA indicators by institution. In its 2019 ranking, the Centre for Science and Technology Studies (CWTS) provides a ranking of institutions according to their share of open access publications. This gives an idea of the degree of openness of institutions. However, the fact of not taking into account the disciplinary specificities and the specialization of the institutions makes the rankings based on the shares of the OA publications biased. We show that open access publishing practices vary considerably by discipline. As a result, we propose two methods of normalization of OA share; by WoS subject categories and by OST disciplines. Normalization corrects OA’s share taking into account disciplinary practices. This allows a better comparability of different actors.

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