Presenting a new set of 158 solved problems and projects to supplement the Examples and Exercises available in the textbook Introduction to Composite Materials Design-THIRD edition from CRC Press (2018). This is a companion to that textbook, with frequent cross-referencing guiding the reader to the equations, figures, tables, and specific sections of the textbook relevant for understanding every part of the solution to each of the problems. This workbook does not contain solutions for the Exercises at the end of the chapters in the textbook. Instead, this workbook offers a completely new set of problems, accompanied by detailed step-by-step solutions. These include additional explanations, new figures, and new references to popular design handbooks, material property data, and other sources from the literature. As well as solved problems, this workbook features several complete term-paper ideas in Chapters 2 (Materials) and 3 (Processing). Each idea provides a brief introduction to the solution of each term-paper, and a few citations as a starting point for further study. The Appendix contains a number of project ideas challenging enough to be assigned as semester-long team projects.At the end of each chapter, additional challenge exercises provide an additional opportunity for the reader to master the subject. Most problems are solved by hand, showing every step, with all numerical values substituted into equations from the textbook, ending with the numerical answer to the problem. Wherever computer code is helpful for completing the calculations, the code has been written and displayed using the free, open source language Scilab(TM), similar to MATLAB(R). A few problems are also solved using the free on-line application CADEC (http://cadec-online.com).The THIRD edition of the textbook "Introduction to Composite Materials Design (2018)" implements a number of additions and changes with respect to the second edition. The sign of bending moment is reversed to agree with the standard Mechanics of Materials convention, so all problems involving moment and curvature have been updated. The numbering of Equations, Sections, and Tables are updated. Each table that was landscape in the second edition is now split into two tables to make it easier to read the eBook version of the textbook in portrait mode, so tables numbering has changed significantly. New topics have been added such as Basis Values, Temperature-Dependent Properties, Universal Carpet Plots (in three chapters), and many more, requiring new Problems in this WorkBook. Some equations are rewritten to simplify numerical computations, and those changes are reflected in this WorkBook. In summary, one cannot use the old WorkBook with the third edition of the textbook. Furthermore, this edition has more problems, more Scilab code, and more thorough explanations of the solutions.