x Personal Content Experience: Managing Digital Life in the Mobile Age 5.9 Metadata Processors ........................................... 194 5.10 Summary ........................................................... 195 5.11 References ......................................................... 196 Chapter 6: User Interfaces for Mobile Media ................ 199 6.1 Human in the Loop ............................................. 202 6.1.1 Searching ............................................................. 204 6.1.2 User-Centred Design ............................................ 205 6.2 Interacting with Mobile Personal Content ......... 206 6.2.1 Music ................................................................... 207 6.2.2 Photos .................................................................. 209 6.2.3 Video ................................................................... 211 6.3 Interfaces for Mobile Media Devices ................. 213 6.3.1 Why not Speech User Interfaces for Mobiles? ...... 214 6.3.2 Graphical User Interfaces ..................................... 215 6.3.3 Interaction Technologies and Techniques ............ 216 6.3.4 UI structure and Navigation ................................. 223 6.3.5 Basic UI Components for Mobile Media .............. 230 6.4 Designing a Mobile User Interface ..................... 242 6.4.1 Common UI Design Guidelines ........................... 243 6.4.2 The UI Design Process and Methods ................... 246 6.4.3 Validating the Design ........................................... 252 6.5 Performing the GEMS Tasks ............................... 254 6.5.1 Cross-GEMS Tasks: Browse and Search ................ 254 6.5.2 Get Content ......................................................... 260 6.5.3 Enjoy Content ...................................................... 266 6.5.4 Maintain Content ................................................. 270 6.5.5 Share Content ...................................................... 273 6.5.6 Multi-Tasking in GEMS ......................................... 276 6.6 The Effect of Device Category on UI .................. 277 6.7 Summary ............................................................. 279 6.8 References ........................................................... 280