AAAI–93 Best Written Paper Award Equations for Part-of-Speech Tagging Eugene Charniak, Curtis Hendrickson, Neil Jacobson, Mike Perkowitz Honorable Mentions Planning With Deadlines in Stochastic Domains Thomas Dean, Leslie Pack Kaelbling, Jak Kirman, Ann Nicholson Reasoning with Characteristic Models Henry A. Kautz, Michael J. Kearns, Bart Selman The Paradoxical Success of Fuzzy Logic Charles Elkan Each year, AAAI’s National Conference on Artificial Intelligence honors a handful of papers that exemplify high standards in exposition and pedagogy. Papers are nominated for the Best Written Paper Award by members of the program committee during the NCAI review process. These nominations are then reviewed once again by a smaller subset of the program committee to select a winning paper and honorable mentions. Care is taken during the review process to ensure that our final decisions are based on the opinions of impartial readers who are free from personal biases and conflicts of interest. We wish to thank the following individuals for their reviewing efforts on behalf of the Best Written Paper Award: William Cohen, Mark Drummond, Charles Elkan, Ken Forbus, Wendy Lehnert.