(from the Greek “psyche” + “diagnosis”) is a psychological system that develops ways to identify and study a person’s individual psychological characteristics; it serves as a link between general psychological research and practice. Synonymous with psychodiagnosis. Indicates psychological diagnosis. Also to the field of psychological practice, It is the work of a psychologist to identify various qualities, mental, psychological, physiological and personality traits. Psychiatric diagnosis involves the construction and testing of methods, and develop their own requirements as measurement instruments, and the development of rules for conducting surveys, Methods of processing and interpreting the results, Discuss the possibilities and limitations of different methods. The directions of theoretical and methodological work in the field of psychodiagnostics are determined primarily by the requirements of psychological practice, according to which specific complexes of psychodiagnostic methods corresponding to the areas of work of practical psychologists (education, medicine, personnel check, etc). The emergence of psychodiagnosis as a branch of psychological science can be attributed to the late nineteenth – early twentieth century (A. Binet, F. Galton, J. Cattell, G. Rossolimo, etc).