Excerpt: The difference between realism and constructivism is reduced from an epistemological distinction to merely a difference in (epistemological) attitude… Both modes of thinking – the realist just like the constructivist – are manifestations of an argumentation technique.
Mitterer J. (2008) (Radical) Constructivism – What Difference Does It Make? Constructivist Foundations 3(3): 160–162. Available at http://constructivist.info/3/3/160.mitterer