Since 1989, the French public sector has imitated the private sector's further education and training mechanisms. But today, it seems that just as in the private sector, the training policies in the public sector have severe limitations. Based on a case study of a large public research institute and on a national survey making it possible to compare the private and public sectors, the paper studies the further education and training policies and their links with the organizational needs. In the public sector, the difficult balance between individual's choices and strategic management comes on the one hand from the specificities of the administrative rules of human resource management, and on the other hand from the unions' power and strategies. Faced with new challenges (demographic evolutions, decentralisation, new demands from the users of public services), the French public sector must develop new training policies.