May 2, 2008 lecture by Krzysztof Gajos for the Stanford University Human Computer Interaction Seminar (CS547).  User Interfaces delivered with today’s software are usually created in a one-size-fits-all manner, making implicit assumptions about the needs, abilities, and preferences of the "average user" and the characteristics of the "average device." Krzysztof Gajos argues that personalized user interfaces, which are adapted to a persons devices, tasks, preferences, and abilities, can improve user satisfaction and performance.