List of Figures

• Excerpt of raw log file data from nn and xrn.
• Histogram of the fraction of available articles users actually read. The height of each bar represents the number of times users read the listed fraction of available articles.
• Scatterplot of the number of articles available to be read in a newsgroup versus the number of articles users actually read.
• Block diagram of the collaborative filtering architecture.
• Block diagram for vote server. The major components are the daemon (voted) which accepts and handles connections from clients and the vote server (vs) which updates and maintains the vote database.
• Interface for the xrn news reader client. Main window on right, filtering controls on left.
• Portion of xrn main window showing a list of available articles sorted by order of popularity. The numbers in `()' represent the number of positive and negative votes received by the articles.
• The first tier in the nn interface: selecting the articles to read. The highlighted article marked with a `$' has been autoselected by the collaborative filtering system.
• The second tier in the nn interface: reading the selected articles. Users are reminded to vote by the line at the bottom.
• Number of votes cast at Xerox PARC during the period from August 1993 till December 1993. Each bar represents the number of votes cast during the week beginning on the listed Sunday.