It highlights the many voices contributing to AAAI by featuring personal remembrances and visions from many people, including founders of AAAI, presidents who guided the society's development, and others spurring on AI research and applications. While a single issue can only scratch the surface, this special issue clearly illustrates the spirit, accomplishment, and optimism that will drive the next 25 years. It is fitting for AI Magazine to present such a commemoration: 2005 is the twenty-fifth anniversary of the magazine as well. From the beginning, AI Magazine has brought the AI community together to share ideas and advances and to introduce newcomers to the challenges and accomplishments of the field. With circulation that is roughly one quarter international, the magazine serves a worldwide audience.

I'm delighted to bring our readers the news of an exciting resource for AAAI members. AAAI has now completed a major initiative, begun five years ago, to develop a digital library of AAAI publications. The collection now comprises approximately 13,000 papers, including the full set of papers from the AAAI proceedings, papers from other major conferences, AAAI workshop and symposium technical reports, selected AAAI Press books, and the full contents of AI Magazine. This already-extensive collection is a growing resource, with new publications and access methods to be added over time. I encourage readers to visit it at the members' library section of the AAAI web site, www.aaai.org.

In the span of a few months, the AI community lost four important figures. The fall of 2002 marked the passing of Ray Reiter, for whom a memorial article by Jack Minker appears in this issue. As the issue was going to press, AI lost Saul Amarel, Norm Nielsen, and Charles Rosen. This section of AI Magazine commemorates these friends, leaders, and AI pioneers. We thank Tom Mitchell and Casimir Kulikowski for their memorial to Saul Amarel, Ray Perrault for his remembrance of Norm Nielsen, and Peter Hart and Nils Nilsson for their tribute to Charles Rosen. The AI community mourns our lost colleagues and gratefully remembers their contributions, which meant so much to so many and to the advancement of artificial intelligence as a whole.

After outstanding service as Book Review Editor, B. Chandrasekaran has completed his term. His energetic guidance of the book reviews section brought the magazine a rich set of reviews that were always eagerly anticipated, and I would like to thank him for his important contributions. I am delighted to announce that Michael Wellman, of the University of Michigan, has agreed to join the magazine as the new Book Review Editor. I know that the book reviews feature will flourish under his stewardship, and I enthusiastically welcome him to the magazine. I would also like to draw readers' attention to a related addition to the AI Magazine web site (www.aimagazine.org).

One of the roles of AI Magazine is to keep readers informed about the practical impact of AI research. One year ago, articles in the magazine described two robotics challenge domains, RoboCup rescue and urban search and rescue, both designed to promote research related to robotic agents for disaster search and rescue. In the tragic aftermath of the World Trade Center attack, research experiments were replaced by reality as search and rescue robots moved into the field, assisting in the World Trade Center rescue efforts. The current issue includes an article discussing lessons from this experience. For many AAAI members, the first news of the robot rescue efforts came from AI Alert, a AAAI service that distributes selected items from the AI in the News page on AAAI's AI Topics web site.

Austin, Texas, the "live music capital For more information about AAAI is pleased to announce the continued Conferences/conferences.html. Expository Writing Award will be presented members. AAAI is delighted to announce the 31-August 3 in Austin, Texas. This The conference will be held July collocation of SARA-2000 with AAAIaward joins the two special awards 31-August 3, 2000, at the Austin Convention 2000. The Symposium on Abstraction, established last year, the AAAI Classic Center and Hyatt Regency Reformulation, and Approximation Paper Award and the AAAI Distinguished Austin in Austin, Texas. AAAI-2000 will be held July 26-29, just outside Austin in Lago Vista on Lake Travis, Service Award. For more information about The AAAI Effective Expository Writing the Innovative Applications of SARA-2000, please visit sara2000.unl. Award honors the author(s) of a Artificial Intelligence, the Mobile edu/ high-quality, effective piece of writing, Robot Competition and Exhibition, AAAI also welcomes SARA-2000 as accessible to the general public or the Intelligent Systems Demonstrations, our first affiliate conference. For more to a broad AI audience (not just a subarea), the Robot Building Laboratory, information about the AAAI Affiliates written within the last two and the Doctoral Consortium. New Program, please write to Carol Hamilton years. The contribution should be for 2000 will be a technical paper at hamilton@aaai.org. Nominated papers must be Uncertainty: Operations Research AAAI is pleased to announce the continuation in English and must have been published Meets AI (Again)"; Justine Cassell, of its Student Abstract and in a publicly accessible place "Why Do We Need a Body Anyway?"; Poster Program, the SIGART/AAAI (for example, periodical, hard copy, or Carla Gomes, "Structure, Duality, and Doctoral Consortium, and the AAAI online journal but not only as a web Randomization: Common Themes in Scholarship and Volunteer Programs. The author(s) AI and OR"; James Hendler, "Missed Students interested in attending the of the award-winning paper(s) will Perceptions: AI versus the Funding National Conference on Artificial receive a $2500 prize (shared if more Agencies"; Geoff Hinton, "Modeling Intelligence in Austin, July 31-August than one author) as well as lodging High-Dimensional Data Distributions 3, 2000, should consult the AAAI web and travel to the National Conference by Combining Simple Experts"; Rich site for further information about all on Artificial Intelligence.

First, I would The editorial board members will play an active role in like to welcome B. Chandrasekaran, guiding the magazine, monitoring progress across the field of The Ohio and assuring that the magazine has timely, high-quality State University, as the articles on significant new developments. I expect the editorial new book review editor, board to have a considerable impact on the magazine, and Robert Morris, of and I am very grateful to the board members for NASA Ames Research Center, accepting this responsibility. I know that they will do an Finally, to expedite the processing of submissions, AI outstanding job, and I urge the AI community to actively Magazine will now accept submissions in electronic form. Full submission guidelines are available on the AI Magazine Chandrasekaran has prepared an editorial, appearing in home page, www.aaai.org/Magazine. I look forward to your this issue, presenting his vision for the book review section.

It is a medium for disseminating information like to thank the Publications Committee for selecting me about AI areas and methods to readers across the entire as Editor, and especially to thank the Publications Committee field of AI, as well as to a broad multidisciplinary audience. Chair, Kenneth Ford, the previous Editor, Jude Shavlik, It is a journal of record for articles on important research and Publishing Consultant Mike Hamilton, for their warm and applications advances as well as for meeting reports, reviews, welcome, help, and very valuable guidance as I have embarked and discussions that illuminate the state of the art on the editorship. I am delighted to begin my term and emerging areas. Equally important, it is a forum for as Editor and look forward to working with the many who sharing visions for the field--perspectives on issues, priorities, contribute to AI Magazine's success. Indiana University helps to shape the future of artificial intelligence.

The Association for the Advancement of Artificial Intelligence sponsored a number of workshops in conjunction with the Eleventh National Conference on Artificial Intelligence held 11-15 July 1993 in Washington, D.C. This article contains reports of four of the workshops that were conducted: AI Models for System Engineering, Case-Based Reasoning, Reasoning about Function, and Validation and Verification of Knowledge Based Systems.

The Association for the Advancement of Artificial Intelligence sponsored a number of workshops in conjunction with the Eleventh National Conference on Artificial Intelligence held 11-15 July 1993 in Washington, D.C. This article contains reports of four of the workshops that were conducted: AI Models for System Engineering, Case-Based Reasoning, Reasoning about Function, and Validation and Verification of Knowledge Based Systems.