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Discourse analysis is becoming an increasingly common approach in planning and environmental policy research. This paper asserts that the generic treatment of discourse analysis obscures distinct approaches where `discourses¿ can combine different elements of text, systems of thought, and action. Textually-oriented approaches have been more prevalent over the 1990s but this paper explores a different approach, grounded in the theory of Michel Foucault, which broadens discourse to embrace social action. Comparing and contrasting two studies which have utilised this approach, the paper suggests that there is considerable room for variation concerning the subjects of study, the institutional scale of analyses, the methods of investigation, and process of analysis. Nevertheless, this paper identifies certain core elements of a Foucauldian discourse analytic approach. The paper concludes that this emerging approach to discourse analysis promises considerable insights if applied more widely in planning and environmental research.