<p>Recent researches show properties such as chaotic determinism, fractal dimension, or fuzziness, from which we can derive that reality, is consistently complex in its psychical and social manifestations. This suggests that a complex social science and psychology might exist. The present work shows the meaning of the historical origin of complexity, the reasons and the effects of its subsequent abandon and its actual recuperation as an epistemology of the complexity. That contributes to the understanding the human being as a paradoxical being who is the same time, tidy and chaotic, regular and irregular, contradictory and fuzzy in both his personality and behavior.</p><p>pp. 23-31</p>