The fifth edition of Strategic Management of Technology and Innovation, like its predecessors, is inspired by the work of the many colleagues who have helped shape this dynamic and important field. We continue to be grateful to all our own teachers and current colleagues that have contributed to the perspective that informs our conceptual framework and choice of materials. We also want to thank the new scholars who have contributed directly to the materials in this fifth edition by letting us use their work, as well as our research associates and collaborators on the cases and industry notes. We are also grateful for the generous help of the anonymous colleagues who have provided insightful and helpful comments on the fourth edition so as to improve the fifth one.

Ultimately, the test of the value of teaching materials lies in their use in the classroom. Many hundreds of Stanford and Harvard M.B.A. students and executive education participants have helped us with that test. We thank them for their feedback and comments.

Robert Burgelman wants to express special thanks to Dr. Andrew S. Grove, Chairman of Intel Corporation, who has continued to be a valued colleague at Stanford Business School, and to Research Associate Philip Meza, who has co-authored many cases and notes. Clayton Christensen extends his gratitude to Professors Burgelman and Wheelwright, both of whom have been patient mentors who have profoundly influenced his understanding of technology and innovation management. His research associate Scott Anthony, representing the finest of the next generation of innovation scholars, has been consistently helpful and insightful. Steven Wheelwright extends his special thanks to Robert Burgelman and Clayton Christensen and many other colleagues who have carried on this work without his direct help so that he could accept an assignment in Laie, Hawaii (Oahu) to serve as President of Brigham Young University—Hawaii.

The fifth edition of Strategic Management of Technology and Innovation would not have been possible without the support of Stanford Business School and Harvard Business School. For Robert Burgelman, this has come through the ongoing support for his research and course development thanks to a large extent to the generous contributions of the school's alumni and friends. Steven Wheelwright and Clayton Christensen are similarly indebted to the students, alumni, and directors of research at the Harvard Business School, who have selflessly shared their ideas and resources.

As anyone who has completed a book-length manuscript knows, the final product is a team effort. This fifth edition would not have been completed without the help of our McGraw-Hill team, including: Laura Hurst Spell, managing developmental editor; Jane Beck editorial assistant; Rhonda Seelinger, executive marketing manager; Christine Vaughan, lead project manager; Carol Bielski, lead production supervisor; Joanne Mennemeier; design coordinator; and Greg Bates, senior media project manager. We also wish to acknowledge Nanci Moore, Robert Burgelman's administrative assistant at Stanford Business School; and Nanci Moore and Lisa Stone, both of Harvard Business School.

Finally, a word of thanks to Rita Burgelman, Christine Christensen, and Margaret Wheelwright for their continued patience, understanding, and support.