A multiparameter extension of the @H02732@ to quantify the role of enhanced @M03844@ on the reactivity of meta- and para-substituted benzene derivatives, e.g. \[\log _{10}k = \log _{10}k_{0}+\rho \ [\sigma +r\ (\sigma^{+}-\sigma)]\] The parameter \(r\) gives the enhanced @M03844@ on the scale (\(\sigma ^{+}\,-\sigma\)) or (\(\sigma\,-\sigma \)), respectively.