There are two very contrasting approaches to reading this book and learning about organizational design. The more traditional approach is to read the book, and then use the OrgCon on cases and applications. The second approach is to begin with the OrgCon software and only examine the book as you find it helpful. Which approach is better? It is your choice, not ours. In our experience, students in organizational design prefer to start with the OrgCon and a case, rather than with the book itself. Readers who have more background in organization theory and design usually examine the book first. There are numerous changes in the third edition. The literature review in each chapter has been updated. The information processing approach is strengthened and applied more comprehensively as the theoretical underpinnings. Throughout we have rewritten the text beyond normal editing in an attempt to make the presentation clearer and easier to read.