  Due to the overbinding that is inherent in existing {\em local}
approximations to the density-functional formalism, certain reaction energies
have not been accessible. Since the generalized gradient approximation
significantly decreases the overbinding, prospects for density-functional-based
reaction dynamics are promising. Results on the generalized-gradient based
determination of the CH3-CH4 hydrogen exchange reaction are presented.
Including all Born-Oppenheimer effects an energy barrier of 9.5 kcal/Mole is
found which is a very significant improvement over the local-density
approximation.
