The desktop metaphor is beginning to show signs of strain in supporting modern knowledge work. Our research seeks to demonstrate how the traditional desktop metaphor can be re-envisioned, replacing a focus on documents and applications with user interaction based upon semantically meaningful activities. In this demonstration, we present Giornata, an application that augments the OS X desktop with interface components that emphasize the role of activity in knowledge work. Giornata provides a number of innovative features not present in other systems, including activity-based resource storage, a mechanism for incrementally tagging activities, and integrated tools to foster collaboration within activities. ACM Classification: H5.2 [Information interfaces and presentation]: User Interfaces—Graphical user interfaces
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