  The distribution of energy level separations for lattices of sizes up to
28$\times$28$\times$28 sites is numerically calculated for the Anderson model.
The results show one-parameter scaling. The size-independent universality of
the critical level spacing distribution allows to detect with high precision
the critical disorder $W_{c}=16.35$. The scaling properties yield the critical
exponent, $\nu =1.45 \pm 0.08$, and the disorder dependence of the correlation
length.
