1. Bars 2. Trusses 3. 2-D Linear Interpolation 4. Clough's Triangular element 5. Taig's Convex Quardrilateral Elements 6. Iron's Patch Test 7. Four-Node Elements 8. Incompressible Plane Strain Elements: Locking-Free in the x and y Directions 9. Conclusions A. Symbolics B. Trusses C. Triangulation D. Linear Elasticity E. Area Integration F. Variational Formulation G. Four-Nodeā¦