  The fundamental program in high energy spin physics focuses on the spin
structure of the nucleon. The gluon and orbital angular momentum components of
the nucleon spin are virtually unknown. The J_z=1/2 sum rule involves the
integrated parton densities and can be used to extract information on the
orbital angular momentum and its evolution. To avoid any bias on a model of
Delta G, we assume that the gluon asymmetry, A=Delta G/G can be used to extract
Delta G over a reasonable kinematic region. Combining the results for Delta G
with the evolution equations, we can determine a theoretical expression for the
orbital angular momentum and its evolution.
