Knowledge as we know it from the famous phrase of Francis Bacon – coined some four hundred years ago at the beginning of the period of modernity and capitalism – is power. Using different frames of reference – social theory, social policy and social history – to learn about the history of the knowledge question, we have to study scholarly works like Toulmin’s Cosmopolis: the hidden agenda of modernity (1990), Burke’s A Social History of Knowledge (1997) and Kintzinger’s Wissen wird Macht. Bildung im Mittelalter (2003) (Knowledge becomes power. Bildung in medieval times). One strand of these discourses, today, we find in Foucault’s talk of ‘truth regimes’; another in Chomsky’s ‘pedagogy of lies’ (2000). This shows that the knowledge question has not gone away, but accompanies us in societies and education. Moreover, knowledge, we are told by the press, politicians and institutions like the Organisation for Economic Cooperation and Development, the European Union, the United Nations Educational, Cultural and Scientific Organisation, and researchers, is much more relevant than ever before in the history of mankind. It is maintained that there should be a real development to a new type of society, the knowledge society. Therefore we have to deal with the problem of the ‘knowledge gap’, resulting from what is called the ‘digital divide’ (Castells, 2002). This is not only a problem for education but for social policy, too. And we have to deal with the problem of knowledge and international economic competitiveness – it may be that this is really grounded in (some) processes of globalisation. It could be that there is a transformation within the capitalist society, from Fordism to post-Fordism (Jessop 2005), to be reflected by sociological analysis (Therborn, 2000). There are many weighty allegations that do not admit easy answers. But it seems clear that social scientists and educators face some new challenges connected with questions of the status and the state of the art of knowledge today. This requires differentiations like the following, aiming at knowledge and society, knowledge production, knowledge distribution, knowledge and education, and knowledge and capitalism (cf. Postone, 1996; Peters, 2003; Gorz, 2004; Kincheloe, 2004