errors of polynomial coefficients

The existing methods for assessing of the sensitivity of the polynomials roots of the transfer functions to changes in their coefficients were analyzed in this article. Particular attention was paid to the case of the multiple polynomials roots of the transfer functions, leading to a drastic impact of slightest error in polynomial coefficients on result of their roots finding. The basic mathematical equations for assessing the sensitivity of polynomials roots of the transfer functions to changes in their coefficients were described.