This article examines two approaches to the analysis and critical assessment of scientific argumentation. The first approach employs the discourse theory that Jurgen Habermas has developed on the basis of his theory of communicative action and applied to the areas of politics and law. Using his analysis of law and democracy in his Between Facts and Norms as a kind of template, I sketch the main steps in a Habermasian discourse theory of science. Difficulties in his approach motivate my proposal (...) of an alternative approach that starts not with a theory of communicative action but with some broad categories drawn from argumentation theory. Using these categories, one can survey the various conceptions of scientific argumentation that have already emerged in the multi-disciplinary field of science studies. The more flexible, open-ended theoretic categories put one in a better position to'develop cooperative interdisciplinary studies that can inform the critical assessment of scientific argumentation. (shrink)