<XML><RECORDS><RECORD><REFERENCE_TYPE>0</REFERENCE_TYPE><REFNUM>5253</REFNUM><AUTHORS><AUTHOR>Chalmers,M.</AUTHOR></AUTHORS><YEAR>1999</YEAR><TITLE>Recer: Social Navigation based on Subjectivity and Context</TITLE><PLACE_PUBLISHED>Preferred Placement - The Jan Van Eyck Academy Fellowship Symposium, (Amsterdam) </PLACE_PUBLISHED><PUBLISHER>N/A</PUBLISHER><LABEL>Chalmers:1999:5253</LABEL><ABSTRACT>We describe recent work on the path model, an extension of recommender systems that focuses on the temporal order of information activity. URLs and words displayed in a web browser, as well as filenames, words and symbols used in the xemacs editor, are timestamped and logged in paths. Recommendations are made by comparing the representation of the user?s ongoing activity with the rest of their path, and with the paths of selected others. The prototype system described thus affords access to and reuse of program files, class names, variables, URLs and words consistently used in similar contexts. We treat heterogeneous data uniformly, as symbols. The Recer system relies on recurrent patterns of symbol use that emerge from activity, and that form adaptive and subjective categorisations. We describe the system?s implementation and our early experience with it, and contrast our approach with that of traditional IR. We discuss ways in which such recommender systems are set in a wider system of activity tracking, profiling, and commerce, and discuss the tradeoffs between of locality and privacy of information with its publicity and economics. </ABSTRACT><NOTES>Invited paper</NOTES></RECORD></RECORDS></XML>