1. Introduction. History. Mechanisms of damage. Definition of wear. 2. Microstructure and Mechanical Properties of Materials. Structure of solids. Structure of solid surfaces. Volume properties of materials. Surface properties of materials. 3. Surfaces in Contact. Surface topography. Contact mechanics. Surface temperature. 4. Classification of Wear Processes. Tribosystem. Wear mechanism. Worn surfaces. Tribological testing. 5. Grooving Wear. Wear mechanism. Metals. Polymers. Ceramics. Composites. 6. Sliding Wear. Wear mechanism. The progress of wear. Influence of surface roughness. Metals. Polymers. Ceramics. Composites. 7. Rolling-Sliding Wear of Metals. Wear mechanism. Operating conditions. Microstructure and properties of materials. 8. Erosive Wear of Metals. Wear mechanism. Physical properties. Microstructural elements. (All chapters include References). Subject Index.