This book presents the basic theories underlying x-ray and neutron scattering, as well as the various techniques that have been developed for their application to the study of polymers. The two scattering methods are discussed together from the beginning, so as to allow readers to gain a unified view of the scattering phenomena. The book is introductory and may be used as a textbook in polumer science class or for self-study by polymer scientists new in scattering techniques.