The development of the dynamics of scientific knowledge is impossible without constant revision, analysis, and correction of the initial philosophical bases, methodological tools, and methods of scientific work. On the level of an individual consciousness of a scientist, this function is fulfilled by scientific reflexion. This paper is devoted to developing a theoretical model of scientific reflexion for psychological research. On the basis of the presented theoretical model the system of diagnostic criteria of scientific reflexion in historical-psychological research is developed. Two methods of scientific reflexion research are developed and tested. The book is addressed to scientific psychologists, both theoreticians and practitioners, philosophers, methodologists, as well as to graduate and undergraduate students; to everyone who is interested in the problems of general psychology.