Quantifying reactivity in substrates and electrophiles
One large body of work aiming to quantify electrophilicity was accumulated by the Mayr group. Numerous reagents were tested against typical substrates, recording the kinetic rate constants allowed to attribute electrophilicity / nucleophilicity along the equation of 

$$ \log k (\pu{20 ^\circ{}C}) = s_N (N + E) $$

with 
$E$ = electrophilicity parameter 
$N$ = nucleophilicity parameter 
$s_N$ = nucleophile-specific sensitivity parameter

Beside the selection of publication mentioned on the group page, work was invested to create a map, and a public database with currently "1075 nucleophiles and 276 electrophiles".