  The main focus of these lectures is on those aspects of deep inelastic
scattering that can be derived directly from QCD using quantum field theory,
without recourse to phenomenological models. The emphasis is on spin dependent
scattering, but the theory of spin averaged scattering is also discussed. A
detailed analysis is given for the case of spin 1/2 targets, with a brief
discussion of higher spin targets at the end. The QCD derivation of the
Callan-Gross relation, the longitudinal structure function $F_L$, and the
Bjorken and Ellis-Jaffe sum rules is presented. I also discuss the
Wilczek-Wandzura contribution to $g_2$, and why the Gottfried sum rule does not
hold in QCD.
