The basic result of the coupling model consists of a cross-over from e
xp-(t/tau(o)) to exp-(t/tau)(1-n) at a temperature insensitive micros
copic time t(c). We indicate how this basic result can be derived from
chaotic, interacting Hamiltonian systems which include densely packed
polymer molecules. Recent quasielastic neutron scattering experiments
and molecular dynamics simulations are discussed and the results are
shown to support this result as well. An application of the coupling m
odel to find how the viscoelasticity of a polymer depends on the chemi
cal structure of the monomer through the coupling parameter of the loc
al segmental motion is given to illustrate the utility of the model.