This thesis examines the activities within the Swedish steering system concerning upper secondary school. Sweden has a long history of shared responsibility between the state level of government and the municipalities, dating back to federal decisions concerning the establishment of a compulsory school system. By the early 1990s two parallel changes were taking place within the Swedish educational sector, one concerning the steering system which evolved towards deregulation and decentralization, and the other an extension of the compulsory school. A consequence of the latter change was that in practice upper secondary education became mandatory. The political aim was to realize the vision of “one school for all”. In this study the political vision and the larger question of how to turn it into reality (the differentiation question) is used to show how activities at national as well as the local level of the steering system are formed