The leading log approximation to Quantum Chromodynamics is derived, including the effects of gluon spin. The use of the leading log approximation in simulating Quantum Chromodynamic events is described. Models for the formation of hadrons from quarks and gluons are reviewed. A model for hadron hadron scattering, using the leading log approximation and a particular model for hadron formation is described. This model is used to study the results of calorimetric experiments.
