Abstract If languages were not both means of and obstacles to communication, they would not be an object of political concern. Basic concepts and theories applied to the analysis of language as an object of policy making are introduced in this chapter, among them politics, diversity, abstand and ausbau, status planning, corpus planning, acquisition planning, domain, proficiency, language shift, language rights, legitimate language, and language ideology. As for theory, the chapter expounds differences and commonalities of language policy (closer to political science) and language planning (closer to linguistics). It argues that because of the contingency of social science concepts and language ideologies no generally accepted theory for analysing policy decisions concerning language as a rule-governed system, on one hand, and society as a rule-governed system, on the other, is available, and that the highest priority of such a theory is to explain the causes of language conflicts.
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