Many people have given me support, encouragement, and advice throughout the process of researching and writing this thesis. They include Nobuko Asakai, Wendy Chien, Randy Graebner, Samuel J. Klein, Vicki Kwok, Rajeev Surati, and my parents. A very special thanks also goes to Jon Salz, whose help was invaluable throughout the design and implementation of the clickstream system.