Abstract
The proposed reflection on the definitions of the doctoral thesis in architecture takes the form of a theoretical compass, enabling us to find our bearings in the expanding universe of knowledge production in architecture (theses, theories) by crossing two axes: the axis of epistemological tensions distinguishes between the retrospective aims of research of a historical nature, and the prospective aims specific to both the human sciences and the engineering sciences concerned with architectural objects. The axis of tensions between disciplinary and professional projects distinguishes and recognizes two approaches to "theory as project": the retroactive nature of reflective projects and the proactive nature of prescriptive projects.