The following article attempts to be a contribution to the reflection on the lines of continuity, proximity relations and possibles elements of differentiationon two theoretical fields of growing importance within the social sciences: theory of systems of Niklas Luhmann and the deconstruction of Jacques Derrida. Along with accounting for the extent of both theories for reflection on the foundations of the social sciences, this article tries to install some useful questions for self-observation of the epistemological foundations of this field of knowledge.