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The development of the course-of-action research program has included both the creation of methods of data construction and the transformation of methods belonging to other research programs. Several aspects of the resulting methodology are still original today. The methods of self-confrontation and re-enactment through material traces of the activity are central. Each of these two methods is developed along two ways, one aiming at the controlled expression of actors’pre-reflective consciousness, the other aiming at both actors’participation in the analysis of their own activity and the pursuit with less control of the expression of actors’pre-reflective consciousness. The article presents the resulting four methods along with the ontological hypotheses and the epistemological hypotheses and principles which command their creation and their development.