Abstract: Abstract. The study focuses on the issues of adequate forecasting of investment in scientific and technical products and expertise of design solutions in order to support management decision-making at the early stages of the life cycle of such products. The implementation of design solutions being considered in the planning of production volumes is associated with non-recurring costs related to the development, production and operation of the products. The main areas of the study are: forecast of the cost of scientific and technical products, determination of the volume of investment in production and estimation of operating costs. The methodological basis of the study involves the methods of economic forecasting, systemic analysis as well as the theory of reliability and the theory of design and testing of complex systems. The main results of the study can be summarized as follows: the development of adapted methods to forecast the cost of scientific and technical products, determine the volume of investment in production and operating costs; the practical use (combined application) of these methods enabling to substantiate the needed amount of investments into scientific and technical products at the stage of design solutions

Keywords: operating costs, product cost, management of product development, forecasting investment, economic forecasting, scientific and technical products, analysis of design solutions, scientific and technical forecasting, volunme of investment, production