The article deals with the issues of computer modeling of the processes of educationerror of forecasting the state of the object of control. To analyze the process of forming errors in the implementation of forecasting methods, the main stages of solving this problem are identified. The structural and functional organization of forecasting the state of the object of control is presented. A model for the formation of errors in solving the prediction problem in the automated system of technical condition control has been developed. The simulation was carried out according to the developed algorithm for assessing errors in the implementation of the individual forecasting method. Based on the results of the simulation, the analytical dependences of the random component error of the prediction on the length of the taken into account background and the level of noise of the ideal trend are established. Keywords: prognostic control; principle of minimax; method-guaranteed forecasting; prediction error. UDC 621. 391. Sansevich V. K. Bezruchko V. V. MODELING THE ERROR E