  In this talk, I will concentrate on $Q^2$-dependence of deep inelastic sum
rules. I will first give a modern definition of deep-inelastic sum rules and
then discuss physical origins of their scaling violation at finite $Q^2$.
Following this, I discuss a few well-known examples, in particular, the Bjorken
sum rule, which is at the center of interest of this symposium. Finally, I
consider the $Q^2 \to 0$ limit of sum rules using low-energy theorems. I think
this can motivate some interesting CEBAF physics.
