Digital devices today have little understanding of their real-world context, and as a result they often make stupid mistakes. To improve this situation we are developing a database of world knowledge called ThoughtTreasure at the same time that we develop intelligent applications. In this paper we present one such application, SensiCal, a calendar with a degree of common sense. We discuss the pieces of common sense important in calendar management and present methods for extracting relevant information from calendar items.

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Ghemawat, Sanjay. (1993). ical; An X bused calendar program (Online).Available: http://www.research.digital.com/SRC/personal/Sanjay~G hemawat/ical/doc.html Palo Alto, CA: Digital Equipment Corporation.
	2	Robyn Kozierok , Pattie Maes, A learning interface agent for scheduling meetings, Proceedings of the 1st international conference on Intelligent user interfaces, p.81-88, January 04-07, 1993, Orlando, Florida, United States  [doi>10.1145/169891.169908]
	3	Douglas B. Lenat, CYC: a large-scale investment in knowledge infrastructure, Communications of the ACM, v.38 n.11, p.33-38, Nov. 1995  [doi>10.1145/219717.219745]
	4	Mueller, Erik T. (1998a). Natural language processing with ThoughtTreasure. New York: Signifonn.
	5	Mueller, Erik T. (1998b). ThoughtTreasure Server Protocol (Online). Available: http://www.signiform.com/tt/htm/ttsp.htm
	6	Mueller, Erik T. (1999). Adding common sense to applications using ThoughtTreasure's Java-based client API (Online). Available: http://www.signiform.com/tt/htm/addsense.htm
	7	Nitin Sawhney , Chris Schmandt, Nomadic radio: scaleable and contextual notification for wearable audio messaging, Proceedings of the SIGCHI conference on Human factors in computing systems: the CHI is the limit, p.96-103, May 15-20, 1999, Pittsburgh, Pennsylvania, United States  [doi>10.1145/302979.303005]

• Augmenting shared personal calendars Proceedings of the 15th annual ACM symposium on User interface software and technology
  Joe Tullio ,  Jeremy Goecks ,  Elizabeth D. Mynatt ,  David H. Nguyen
  
  
• Polymer simulation on the hypercube Proceedings of the third conference on Hypercube concurrent computers and applications
  H-Q. Ding
  
  
• Data structures for quadtree approximation and compression Communications of the ACM   28, 9
  Hanan Samet
  
  
• A hierarchical single-key-lock access control using the Chinese remainder theorem Proceedings of the 1992 ACM/SIGAPP Symposium on Applied computing
  Kim S. Lee ,  Huizhu Lu ,  D. D. Fisher
  
  
• The GemStone object database management system Communications of the ACM   34, 10
  Paul Butterworth ,  Allen Otis ,  Jacob Stein