In this paper the features of O.K. Tikhomirov’s approach to human reasoning are discussed. These features are connected with the interpretation of conscious as a system, with the unity of the fields of intellect and senses, with the dynamical interaction of cognitive and personal formations. The author pays attention to the sources of the modern psychology of decision making, which one can find in of personal meanings theory of thinking. It is mentioned in the paper, that O.K. Tikhomirov appealed not only to the methodology of cultural_historical and activity approaches, but also to other methodological conceptions (for instance, K. Popper’s), which support the idea of the pluralism of human’s reasoning.