  A dynamic scaling Ansatz for the approach to the Self-Organized Critical
(SOC) regime is proposed and tested by means of extensive simulations applied
to the Bak-Sneppen model (BS), which exhibits robust SOC behavior. Considering
the short-time scaling behavior of the density of sites ($\rho(t)$) below the
critical value, it is shown that i) starting the dynamics with configurations
such that $\rho(t=0) \to 0$ one observes an {\it initial increase} of the
density with exponent $\theta = 0.12(2)$; ii) using initial configurations with
$\rho(t=0) \to 1$, the density decays with exponent $\delta = 0.47(2)$. It is
also shown that he temporal autocorrelation decays with exponent $C_a =
0.35(2)$. Using these, dynamically determined, critical exponents and suitable
scaling relationships, all known exponents of the BS model can be obtained,
e.g. the dynamical exponent $z = 2.10(5)$, the mass dimension exponent $D =
2.42(5)$, and the exponent of all returns of the activity $\tau_{ALL} =
0.39(2)$, in excellent agreement with values already accepted and obtained
within the SOC regime.
