Ten years ago, with Tom Moran, I edited a book entitled "Design Rationale." I think that book has held up quite well, though a decade onward it does seem a bit prefatory. It is past time for another detailed summary of research on design rationale. Allen Dutoit, Ray McCall, Ivan Mistrik and Barbara Paech have done an excellent job of this in "Rationale management in software engineering." The chapters in this volume show how design rationale can be incorporated into the heart of the software development process - into requirements engineering, software architecture, and code design. (John Carroll, School of Information Sciences and Technology, Penn State University, USA)