[6] Strunk, Jr., William and White, E.B., The Elements of Style, 3rd edition, (Macmillan Publishing Co., Inc., New York, 1979). set of problems to which deterministic, tractable, guaranteedvalid solutions can be found. The authors are quite explicit in pointing out that this idea cannot be retained in its entirety; a major thrust of their work as reported in this volume is to see how much of this view can be salvaged by improvements in representations and algorithms. IN WHAT MIGHT BE CALLED t h e classical formulations of p l a n n i n g as a discipline within AI or cognitive science, there were Reasoning A b o u t Plans by James F. Allen, Henry A. Kautz, Richard N. Pelavin, and Josh D. Tenenberg Morgan Kaufmann Publishers, Inc. San Mateo, Cal. 1991 The Morgan Kaufmann series in Representation and Reasoning, ISSN 1046-9567 ISBN 1-55860-137-6 $39.95 by: Mitchell Marks and Kristian J. Hammond Artificial Intelligence Laboratory, Computer Science Dept. University of Chicago 1100 East 58th Street Chicago, IL 60637 EACH OF THE FOUR AUTHORS has provided one chapter, reporting on his own research and how it fits into a common framework. The first chapter, by Allen,
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