In Europe, Michel Foucault became one of the key theorists of the subject, especially of discourse, and wrote The Archaeology of Knowledge . In this context, the term 'discourse' no longer refers to formal linguistic aspects, but to institutionalized patterns of knowledge that become manifest in disciplinary structures and operate by the connection of knowledge and power. Since the 1970s, Foucault´s works have had an increasing impact especially on discourse analysis in the social sciences. Thus, in modern European social sciences, one can find a wide range of different approaches working with Foucault´s definition of discourse and his theoretical concepts. Apart from the original context in France, there is, at least since 2005, a broad discussion on socio-scientific discourse analysis in Germany. Here, for example, the sociologist Reiner Keller developed his widely recognized ' Sociology of Knowledge Approach to Discourse (SKAD) '.  Following the sociology of knowledge by Peter L. Berger and Thomas Luckmann , Keller argues, that our sense of reality in everyday life and thus the meaning of every objects, actions and events are the product of a permanent, routinized interaction. In this context, SKAD has been developed as a scientific perspective that is able to understand the processes of ' The Social Construction of Reality ' on all levels of social life by combining Michel Foucault's theories of discourse and power with the theory of knowledge by Berger/Luckmann. Whereas the latter primarily focus on the constitution and stabilisation of knowledge on the level of interaction, Foucault's perspective concentrates on institutional contexts of the production and integration of knowledge, where the subject mainly appears to be determined by knowledge and power. Therefore, the 'Sociology of Knowledge Approach to Discourse' can also be seen as an approach to deal with the vividly discussed micro–macro problem in sociology.
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