AAAI–99 Outstanding Paper Award This year, AAAI's National Conference on Artificial Intelligence honors one paper that exemplifies the highest standards in technical contribution and exposition. During the blind review process, members of the Program Committee recommended papers to consider for the Outstanding Paper Award. A subset of the Senior Program Committee, carefully chosen to avoid conflicts of interest, reviewed all these papers and selected the winning paper: PROVERB: The Probabilistic Cruciverbalist Greg A. Keim, Noam M. Shazeer, Michael L. Littman, Sushant Agarwal, Catherine M. Cheves, Joseph Fitzgerald, Jason Grosland, Fan Jiang, Shannon Pollard and Karl Weinmeister Duke University xx