Current design methods for digital control systems to be operated in a continuous environment do not always result in the most efficient use of digital computing hardware. To improve this situation, a dedicated frequency response analysis method was developed for hybrid systems. For practical use of the method, it has been expanded to an analysis method generally applicable to multi-input, multi-output, multi-rate, linear time-invariant hybrid systems. Computer programmes to apply the method have been developed. The calculated frequency responses are presented graphically in Bode, Nyquist and Nichols plots. An application of the method in the field of aircraft control has been elaborated. In this example a tolerance to less conservative digital system design is clearly indicated.