This article contributes to the platform of thought proposed by González Rey in the development of qualitative epistemology and the theory of subjectivity. We discuss three core aspects: firstly, the general epistemological problems of modern science, with its non-critical, non-theoretical scientific ideals, and low reflexivity; secondly, we propose Qualitative Epistemology as an alternative for the study of subjective processes and their complexity, explaining its fundamental principles and its scientific legitimacy. Finally, we present a set of