Front ; Contents; Preface; 1 The Foundation of Modelling; 2 Essential Crystallography and Crystal Dynamics; 3 Electrons; Lattice-Electron Interaction; 5 The Monte Carlo Method; Simulation of Bulk Properties of Solids; 7 The Field Equation; 8 Steady State Simulation of Devices; 9 Alternating Current, Microwaves; Composite Material Devices; 11 Ambipolar Devices; Noise; Computers: Scope of Modelling; Appendix; References; List of Symbols.