  Data on kaon and $\Phi$ production in nuclear collisions as a function of
centrality are analysed both at AGS and SPS energy range. We compare the
results of several experiments, looking for common trend in `participant
scaling' of production yields. We find a smooth description of scaled kaon and
$\Phi$ yields as a function of participant density. We also show a participant
density dependence of kaons and $\Phi$ produced in the forward hemisphere for
proton-nucleus collisions.
