  We study the dependence of primordial nuclear abundances on fundamental
nuclear observables such as binding energies, scattering lengths, neutron
lifetime, \textit{etc.} by varying these quantities. The numerical computations
were performed with four publicly available codes, thus facilitating an
investigation of the model-dependent (systematic) uncertainties on these
dependences. Indeed deviations of the order of a few percent are found.
Moreover, accounting for the temperature dependence of the sensitivity of the
rates to some relevant parameters leads to a reduction of the sensitivity of
the final primordial abundances, which in some cases is appreciable. These
effects are considered to be relevant for studies of the dependence of the
nuclear abundances on fundamental parameters such as quark masses or couplings
underlying the nuclear parameters studied here.
