  I review recent progress in our understanding of the basis of statistical
models for hadronic reactions and of the mechanisms of thermalization in
nonabelian gauge theories. (Invited talk given at the NATO Advanced Research
Workshop on Hot Hadronic Matter: Theory and Experiment, Divonne-le-Bains, June
1994) **Note: The PostScript file of one figure is too large to be easily
transmitted; I will mail a hardcopy upon request.
