The importance of philosophical methodology in the organization of scientific knowledge is recognized. The task of the analysis given in this article was the integration of knowledge on the study of the selfconcept as a psychological phenomenon, since the topic of this research is relevant not only in psychology, but also in philosophy. The history of the development of the self-concept unfolds within the framework of the study of the idea of «I», the consideration of the problems of which originates in ancient cultures and accompanies the entire path of development of philosophical thought, then emerging as a branch of psychological knowledge. Psychological research «I» continues the scientific search for the origins of this phenomenon from the standpoint of various theoretical schools. The study of self-concept is formed as an independent research direction and its central construct, starting with the works of W. James, who for the first time in psychology considers the aspect of considering the «I» by the subject of cognition itself. In subsequent studies, the self-concept is revealed most fully and independentlyin the K. Rogers' phenomenological approach in the mainstream of humanistic psychology.At present, the construction of the selfconcept is influenced by many other theories, both psychological and philosophical, such as Russian philosophical thought of the 20s, the work of transcendentalists and the views of other representatives of philosophy, starting with ideas about the «I» characteristic of the archaic cultures of the East and West.