Context-awareness can improve the usefulness of automated reminders. However, prototypes of context-aware reminder applications have been confined to small research labs, making the evaluation of these tools throughout a personís daily life difficult. Mobile phones provide a convenient and truly ubiquitous platform for the detection of personal context such as location, as well as the delivery of reminders. An interesting question is whether this plat-form can be appropriated for location-based reminders, and how people would employ them. We present Place-Its, a location-based reminder application that runs on mobile phones, enabling people to use location-aware reminders throughout their daily lives. We describe the design of Place-Its and a two-week exploratory user study. The study reveals that location-based reminders are use-ful, in large part because people use location in nuanced ways. Mobile phones prove to be a compelling platform, providing convenience and adequate loca-tion sensing.
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