A Boltzmann equation is given for the early stages of evolution of the gluo
n system produced in a head-on heavy ion collision. The collision term is t
aken from gluon-gluon scattering in the one-gluon approximation. [p(perpend
icular to)] and [p(z)(2)] are evaluated as a function of time using initial
conditions taken from the McLerran-Venugopalan model. (C) 2000 Elsevier Sc
ience B.V. All rights reserved.