Abstract. An algorithm intended for the simulation of “corrections” to characteristics of a general model when exponential distributions are substituted by nonexponential distributions is proposed. This algorithm is used to evaluate the deviation of steady-state probabilities of system GI/G/m/r from steady-state probabilities of system M/M/m/r. A numerical example is given.

Keywords: queuing system, steady-state probabilities, analytical-statistical method, Weibull distribution, estimate variance.