For over twenty years government initiatives have promoted the use of computer/ICT in Swedish schools. This paper, based on national evaluations, briefly describes experiences about these processes, from 1984 to 2004. Discussed are the actors, from outside the school arena, who sat in motion the campaigns and processes at both macro and micro levels. It is concluded that the involvement of teachers at an early stage and a combination of time, technology and the culture of schools are basic conditions for a successful innovation of ICT in school.