Green presents a textbook for senior undergraduate and first-year graduates in materials science and engineering, chemical engineering, chemistry, physics, and related fields. It explains how the mechanisms of transport of atomic or molecular entities that occur in such materials as metals, polymers, inorganic network glasses, and ionic crystals, are related to the structure of these materials. Students are assumed to have completed basic courses on ordinary differential equations and thermodynamics or physical chemistry. The emphasis is on fundamentals. Electronic transport processes are not covered, because they are generally dealt with in a solid state physics course.