  In this paper we present a large-scale sensitivity study of reaction rates in
the main component of the $s$ process. The aim of this study is to identify all
rates, which have a global effect on the $s$ process abundance distribution and
the three most important rates for the production of each isotope. We have
performed a sensitivity study on the radiative $^{13}$C-pocket and on the
convective thermal pulse, sites of the $s$ process in AGB stars. We identified
22 rates, which have the highest impact on the $s$-process abundances in AGB
stars.
