The author substantiates the unsoundness of reductionist concepts of individuality reducing the variety of subsystems of the "person-society" system to the only determinant: definite correlation. Using the principle of multi-multifactorial correlation between higher and lower phenomena of reality, presented by V. S. Merlin, the author states and resolves the problem of different level properties of individuality discernment-by diagnostical, functional and processual methods.