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Explore a comprehensive lecture on personal information retrieval systems in this 1 hour 13 minute talk by Susan Dumais from 2013. Delve into the design and evaluation of "Stuff I've Seen" (SIS), an innovative system that facilitates information re-use. Learn how SIS provides a unified index of previously encountered information across various formats, including emails, web pages, documents, and appointments. Discover the importance of rich contextual cues in the search interface and how they enhance information retrieval. Examine the system's usage by over 230 employees and understand both qualitative and quantitative aspects of its implementation. Gain insights into the significance of time and people as crucial retrieval cues, and how SIS improves information finding while reducing reliance on other search tools.