There is an ever increasing interest in studying electrical conduction and polarization phenomena in polymers. This is partly due to the increasing application of plastics in the electric and electronic industry, partly to the close connection between electric, magnetic and mechanical relaxation phenomena. It is becoming clear that by combination of thermal, electrical, and magnetic methods with scattering techniques, very important information about the response of polymers to external forces can be obtained. This way it is hoped that the complex dynamic behavior of plastic products during their use can be sufficiently accurately described.