Location Techniques -- Audio Location: Accurate Low-Cost Location Sensing -- Using Sound Source Localization in a Home Environment -- Tracking Locations of Moving Hand-Held Displays Using Projected Light -- Activity and Context -- Bathroom Activity Monitoring Based on Sound -- Simultaneous Tracking and Activity Recognition (STAR) Using Many Anonymous, Binary Sensors -- Enhancing Semantic Spaces with Event-Driven Context Interpretation -- The Java Context Awareness Framework (JCAF) – A Service Infrastructure and Programming Framework for Context-Aware Applications -- Location and Privacy -- Place Lab: Device Positioning Using Radio Beacons in the Wild -- Social Disclosure of Place: From Location Technology to Communication Practices -- A Formal Model of Obfuscation and Negotiation for Location Privacy -- Handheld Devices -- A Conceptual Framework for Camera Phone-Based Interaction Techniques -- u-Photo: Interacting with Pervasive Services Using Digital Still Images -- Towards Massively Multi-user Augmented Reality on Handheld Devices -- Sensor Systems -- Design Methodology for Context-Aware Wearable Sensor Systems -- Collaborative Sensing in a Retail Store Using Synchronous Distributed Jam Signalling -- Parasitic Mobility for Pervasive Sensor Networks -- User Interaction -- Decision-Theoretic Planning Meets User Requirements: Enhancements and Studies of an Intelligent Shopping Guide -- Integrating Intra and Extra Gestures into a Mobile and Multimodal Shopping Assistant -- AwareMirror: A Personalized Display Using a Mirror -- Embedded Assessment: Overcoming Barriers to Early Detection with Pervasive Computing.