My research focuses on user modelling, especially:

• a toolkit for user modelling with the design driven by concern for users being able to understand the meaning of their model and means of its derivation;
• tools for constructing user models co-operatively with the user;
• building detailed individual and generic user models from low grade but plentiful monitor data
• building tools to visualise large user models;
• applying user models to intelligent teaching systems;
• and information filtering (which can be seen as pretty much the same thing if the user wants to learn something from the filtered information);
• and delivery of multimedia objects.

Mr. Karlsson, 26, says he "pre-emptively" found all the religious shows in his TV listings and used the "thumbs down" button on his remote control to tell TiVo he has no interest in them. (Giving three thumbs down is the best way to block a program.) After that, his TiVo recorded movies about creepy homicides. "They all have titles like 'Murder on Skeleton Isle,' " says the computer system administrator in Cambridge, Mass.

He uses the "thumbs" button to tell TiVo he hates such films. He also orders cooking shows, which softens TiVo's view of him. "I don't want it thinking I'm an ax murderer," he says.

... Mr. Everett-Church, a privacy consultant for businesses, predicts that as techno-profiling increases, more people will purposely muck up their profiles. They'll fear ordering books on mental illnesses or sexual preferences because they'll wonder if they'll somehow be publicly identified.

... A.J. Meyer, a 35-year-old Web site developer in Minneapolis, ordered the DVD for "Scarface," the Al Pacino gangster movie, from Netflix.com (netflix.com). After that, the site kept recommending movies about gangster rappers. He stopped the assault by giving negative ratings to all movies starring Ice Cube. (Netflix allows members to rate any of its 12,000-plus titles with one to five stars -- whether they have rented a film or not. That helps the site calculate future recommendations.)