The work contains new concepts in system structural identification developed by the author of this work. All the developed concepts reflect the significant properties of a specific type of structural identification, which has the following property. All specific structural identifications related to this type are part of creating a real automatic control system with the required properties under prior structural uncertainty conditions. The work includes a meaningful formulation of the risk problem arising from the practical use of the Mallows' method or its parametric generalization. The work contains the results of a preliminary theoretical study of the risk problem.