Diffusion: Introduction and Case Studies in Metals and Binary Alloys -- The Elementary Diffusion Step in Metals Studied by the Interference of Gamma-Rays, X-Rays and Neutrons -- Diffusion Studies of Solids by Quasielastic Neutron Scattering -- Diffusion in Semiconductors -- Diffusion in Oxides -- Diffusion in Metallic Glasses and Supercooled Melts -- Fluctuations and Growth Phenomena in Surface Diffusion -- Grain Boundary Diffusion in Metals -- NMR and ?-NMR Studies of Diffusion in Interface-Dominated and Disordered Solids -- PFG NMR Studies of Anomalous Diffusion -- Diffusion Measurements by Ultrasonics -- Diffusion in Membranes -- Viscoelasticity and Microscopic Motion in Dense Polymer Systems -- The Molecular Description of Mutual Diffusion Processes in Liquid Mixtures -- Diffusion Measurements in Fluids by Dynamic Light Scattering -- Diffusion in Colloidal and Polymeric Systems -- Field-Assisted Diffusion Studied by Electrophoretic NMR -- Diffusion of Particles on Lattices -- Diffusion on Fractals -- Ionic Transport in Disordered Materials -- Concept of Mismatch and Relaxation for Self-Diffusion and Conduction in Ionic Materials with Disordered Structures -- Diffusion and Conduction in Percolation Systems -- Statistical Theory and Molecular Dynamics of Diffusion in Zeolites.