Annotation: The paper presents the results of scientific research in the field of engineering psychology regarding the creation of a method for selecting a set of psychodiagnostic techniques for the tasks of professional selection and training of specialists in complex ergatic systems. At the present stage, the process of professional selection of specialists of complex ergatic systems is standardized, but its individual components so far remain informal or subjective. This is especially true for the stages of building a specialist standard and the formation of an optimal set of psychodiagnostic techniques. The essential problems of professional selection of specialists are as follows. Most of the methods used to build the standard of specialty are characterized by signifi-cant subjectivity and directly depend on the qualifications of the expert who conducts the selection. None of the existing specialist models is universal and in the vast majority of cases has a narrow-profile nature. The lack of formalized models of psychodiag-nostic techniques does not allow us to optimally select those that are necessary for the diagnosis of applicants, taking into ac-count existing limitations and resources. When assessing the consistency of experts' opinions, the degree of their competence is not taken into account, which in practice can lead to distortion of the results. The solution of these problems will allow us to develop a system of automated support for building the standard of a specialist’s specialty and to determine the specific psycho-diagnostic techniques necessary for his professional selection. To do this, it is necessary to analyze the structure of professional selection, develop models of psychodiagnostic techniques and build a set of psychodiagnostic techniques, as well as a method for determining it relative to the constructed standards and available resources. The method of selection of a set of psychodiagnostic techniques for the tasks of professional selection and training of specialists of complex ergatic systems developed in the work can be used to automate the process of professional selection of professional workers of any specialization. The novelty of the pro-posed approach lies in formalizing the selection procedure for a set of diagnostic techniques as an optimization task. The devel-oped set of algorithms made it possible to formalize the stages of choosing the optimal set of diagnostic methods in order to solve the problems of choosing the best method for a particular property and constructing a number of methods for a set of properties.