The article deals with the peculiarities of the formation of managerial decisions theory under the influence of the scientific management organization school (1885-1920), namely its key representatives, such as M. Weber, F. U. Taylor, Frank and Lilian Gilbret, G. Emerson and G. Gant. The author focused on characteristic features and peculiarities of ancient management decisions, in particular, that were made by a limited group of leaders. Decisions were almost single-minded and there was lack of authority delegation. While making managerial decisions, attention was focused on the authorities' powers and intuition of the head. The author established that scientific works of F. Taylor were marked as the beginning of the formation of different types of managerial decisions (one of the aspects – breadth of coverage), the effectiveness of which was positively reflected on all employees of the organization. Significant contribution to the development of the theory of managerial decisions were scientific works of M. Weber, which led to a scientific approach to the notion of managerial decisions classification, depending on the types of information received; improve the process of choosing one of the possible alternatives, as well as rationalizing the process of making managerial decisions. The study of G. Henry and married couple Frederick and Lilian Gilbert complemented the theory of making managerial decisions due to the application of the method of analysis and synthesis, which greatly enhanced the formation of the goal in making managerial decisions. G. Emerson's work has been an important contribution to clarifying the notion of goal formation, delegation of authority to middle management (their involvement in planning activities), involvement of competent persons on the part of solving existing problems; introduction of the practice of using modeling in developing management decisions; compliance with the algorithm and sequence of making managerial decisions; improvement of the information basis
managerial decisions, school of scientific management organization, modeling, method of analysis and synthesis, classification of managerial decisions