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 object, action and event is 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 the prementioned Michel Foucault's theories of discourse and power while also introducing the theory of knowledge by Berger/Luckmann. Whereas the latter primarily focus on the constitution and stabilization 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. Perspectives The following are some of the specific theoretical perspectives and analytical approaches used in linguistic discourse analysis: Applied linguistics, an interdisciplinary perspective on linguistic analysis Cognitive neuroscience of discourse comprehension Cognitive psychology, studying the production and comprehension of discourse. Conversation analysis Critical discourse analysis Discursive psychology Emergent grammar Ethnography of communication Functional grammar Interactional sociolinguistics Mediated Stylistics Pragmatics Response based therapy (counselling) Rhetoric Stylistics (linguistics) Sublanguage analysis Tagmemics Text linguistics Variation analysis Although these approaches emphasize different aspects of language use, they all view language as social interaction and are concerned with the social contexts in which discourse is embedded. Often a distinction is made between 'local' structures of discourse (such as relations among sentences, propositions, and turns) and 'global' structures, such as overall topics and the schematic organization of discourses and conversations. For instance, many types of discourse begin with some kind of global 'summary', in titles, headlines, leads, abstracts, and so on. A problem for the discourse analyst is to decide when a particular feature is relevant to the specification required. A question many linguists ask is: "Are there general principles which will determine the relevance or nature of the specification?" Topics of interest Topics of discourse analysis include: The various levels or dimensions of discourse, such as sounds (intonation, etc.), gestures, syntax, the lexicon, style, rhetoric, meanings, speech acts, moves, strategies, turns,