A widely used intermediate short text by a composite materials pioneer. Both the quantitative and qualitative aspects of analysis are explained. The presentation is concise and tightly organized.Introduction - Properties of an Orthotropic Lamina - Laminated Composites - Strength - Analysis - Structure Property Relationships - Characterization and Behavior of Structures - Appendices: Matrices and Tensors; Equilibrium Equations for Plates; Trigonometric Functions