Here is the twelfth edition. As I indicated in the last edition, I am still in what positive psychologists call flow. I am so engrossed and passionate about my field of organiza tional behavior that time just flies. As I have said before, I take considerable pride in the sustainability of this text. It took me four years to write the first edition, and then about a year to do cach subsequent edition. Because of the rapidly expanding body of knowl-edge in organizational behavior, these revised editions through the years have become increasingly challenging. However, I am still actually even more than ever-in flow in trying to keep this first mainline organizational behavior text totally up-to-date with the very latest and relevant theory building, basic and applied research, and best-practice applications. I decided with this edition to give special recognition of this scientific foun-dation by adding the subtitle-An Evidence-Based Approach. As is now emphasized in the introductory chapter, the time has come to help narrow the theory/research-effective application/practice gap. This has been my mission from the beginning of this text and my now over 20-year editorship of the journal Organizational Dynamics. As hard evidence for this theory/research base for this text, I can say unequivocally that no other organizational behavior text has close to the num ber of footnote references. For example, whereas a few texts may have up to 40 or even 50 references for some chapters, the chapters of this text average more than twice that amount. This latest edition continues the tradition by incorporating recent breakthrough research to provide and add to the evidence on the theories and techniques presented throughout.