Bringing together both new and old results, this book provides a rigorous, systematic, and up-to-date treatment of the theoretical aspects of factorial design. To prepare readers for the general theory of multi-stratum factorial design, the author first presents a unified treatment of several simple designs. In addition to traditional topics and a thorough discussion of the popular minimum aberration criterion, the book covers many topics and results not discussed in related texts. With exercises and numerous examples, it only requires minimal prior knowledge of experimental design.