  Accurate Monte Carlo data from a set of isotherms near the critical point are
analyzed using two RG based complementary representations, given respectively
in terms of $\bar h=h/\mid t \mid^{\beta\delta}$ and $\bar
\tau=t/h^{1/\beta\delta}$. Scaling plots for data on simple cubic Ising
lattices are compared with plots of $ML^{\beta\nu}$ vs. $\mid t \mid L^{1/\nu}$
for increasing $L$ values and with high quality experimental data on
$CrBr_{3}$. Finite size effects and the equation of state are discussed.
