In an effort to respond to the so-called ‘postmodern challenge’ in a way that continues to allow for an understanding of social interaction in time and space, geographers have increasingly turned to the theory of structuration put forward by Anthony Giddens. This theory paints a picture of the human agent as being constrained by sociohistorical circumstances and yet being fundamentally autonomous. The success of Giddens attempt to transcend the traditional dualism of individual and society seems to have been taken for granted by now. In this paper it is shown that a careful, ‘deconstructive’ scrutiny of key concepts as they appear in Giddens's major texts reveals insurmountable problems inherent in language. Specifically, the categories ‘duality of structure’, ‘practical consciousness’, and ‘mutual knowledge’ are each in their turn required to perform two contradictory tasks: The simultaneous blending and separation of determinism and autonomy. The gist of Giddens's attempts to circumvent this task is outlined through a seemingly thorough consideration of the effects of language, and the continued popularity of structuration theory is speculated on in light of its ultimate failure.