[en] This research program involves the theory of dynamical properties of complex molecular systems having many kinds of degrees of freedom and heterogeneous molecular structure. A general feature is how the dynamics of one subsystem are modulated by interactions with the remaining subsystems. Such modulation affects the response, relaxation, and the channeling of processes in the system as a whole. Quantum mechanical coherence and correlation among the components of this system underlie most of the effects encountered. Specific topics discussed are: coherent energy migration in helical polypeptides; squeezed states of light; and nonequilibrium thermodynamics. 2 figs