Introduction -- Truss Model: General Theorems and Methods of Force, Displacement and Finite Elements -- Beam Models: Refinement and Reduction -- Plate Models: Validation and Verification -- Solids, Membranes and Shells with Drilling Rotations: Complex Structures -- Large Displacements and Instability: Buckling vs. Nonlinear Instability -- Inelasticity: Ultimate Load and Localized Failure -- Brief on Mulitscale, Dynamics and Probability -- References.