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Sida:Ann-1983 JBC25001-00 James Allen - Maintaining knowledge about temporal intervals.pdf/23

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We have described a system for reasoning about temporal intervals that is both expressive and computationally effective. The representation caplures the tenporal hierarchy implicit in many domains by using a hierarchy of reference intervals, which precisely control the amount of deduction performed automatically by the system, This approach is partially usefUL in domains where temporal information is imprecise and relative, and techniques such as dating are not possible. Acknowledgements

Many people have provided significant help during the design and development of this work. In particular, I would like to thank Marc Vilain and Henry Kautz for work on developing and extending the system. I have also received many valuable criticisms from Alan Frisch, Pat Hayes, Hans Koomen, Drew McDermott

, Candy Sidner, and the referees. Finally, I would like to thank Peggy Meeker for preparing the manuscript, and Irene Allen and Henry Kautz for the valuable editorial criticism on the final draft.