The theoretical background necessary for the understanding; prediction and modification of surface properties is provided. Non-crystalline materials are stressed. The course includes use of thermodynamic principles to predict the general chemical and mechanical behavior of glass under a wide variety of environments. Mathematical models provide quantitative descriptions of the performance of these materials in various applications. Individual topics include chemical durability; mechanical properties including environmental effects; friction; wear; grinding and polishing; and surface modification processes such as ion-exchange and de-alkalization processes.