This course is aimed at students in engineering and pure sciences who are interested in the simulation of material properties at many length scales.  The connections between interatomic forces, atomic-scale deformations and defects, and macroscopic properties such as elastic constants, fracture, and yielding, will be presented.  Contact with established concepts such as Voight and Reuss averages for elastic moduli of polycrystals and the Griffith concept of fracture will be made very naturally.  The computational /simulation approaches to dealing with problems at each length scale will also be highlighted.  Scientific visualization tools will be used throughout to demonstrate the physical phenomena being studied.