  The evolution of orbital angular momentum distributions within the radiative
parton model is studied. We use different scenarios for the helicity weighted
parton distributions and consider a broad range of input distributions for
orbital angular momentum. In all cases we are lead to the conclusion that the
absolute value of the average angular momentum per parton peaks at relatively
large $x\approx 0.1$ for perturbatively accessible scales. Furthermore, in all
scenarios considered here the average orbital angular momentum per parton is
several times larger for gluons than for quarks which favours gluon initiated
reactions to measure orbital angular momentum. The large gluon polarization
typically obtained in NLO-fits to DIS data is primarily canceled by the gluon
orbital angular momentum.
