Kozlov (Kabardino-Balkarian State University, Russia) and Zaikov (N. M. Emanuel Institute of Biochemical Physics, Russia) offer a unique generalization of the cluster model of the polymer amorphous state structure, an important problem in polymer physics. The cluster theory suggested is based on a revised understanding of experimental data on the local order zone (cluster) as the main structural unit, allowing for clear quantitative identification of clusters and determination of their relative part, size, number of segments per single cluster, and number of clusters per specific volume. After a brief historical review of opinion on the local order in polymers, chapters cover physical grounds for a cluster model, structural defect within the cluster model, experimental proof, the cluster model and modern physical concepts, the impacts of the polymer structure in the models, and polymer properties. and polymer properties. Annotation 2004 Book News, Inc., Portland, OR