1 Diffusion Processes.- 2 Kinetic Ising Models.- 3 An Overview of Phase Ordering Dynamics.- 4 Domain Growth in Systems with Quenched Disorder.- 5 Surface-Directed Spinodal Decomposition and Surface Enrichment.- 6 Phase Ordering Dynamics in the Complex Ginzburg-Landau Equation.- 7 Quantum Dissipative Systems.- 8 Dissipative Two-State Systems.- 9 Quantum Diffusion.- 10 Coherence and Decoherence.- References.