Colocated with the OpenAIRE General Assembly we organized the workshop "Monitoring OA publishing costs and revenues of publishing initiatives" on Dec-11-2019. Despite all the adverse circumstances of the general strike in Paris, the seminar room was well filled.​ Objectives of the workshop The monitoring of cost information on Open Access publishing is a crucial task in the course of the Open Access transition. The latter can only succeed if sustainable business models can be found acknowledging...