214 Personal Content Experience: Managing Digital Life in the Mobile Age grant, a little diffi cult with the bags in hand, and then there was another call coming in which I tried to check when running the lights at the same time . . . you get the picture. Maybe it’s just that I have a one-track mind. Anyway I dropped a bag and tried to reach it while cross- ing the zebra, and lost my balance. Hate those high heels. I sort of staggered about and then the truck appeared from nowhere, tyres screeching and everything and it almost managed to stop in time, but did hit me such that I was just bumped down on the street. No bones broken or even scratches or anything, but it was scary. People jumped out of cars and cried and called the police and everything; everyone was so agitated, I think I was the only one reasonably calm. The most scared person must have Deena, as she heard everything over the phone, she knew something went wrong but did not have a clue, and she was going all over the place when I fi nally remembered my cell phone and found that our call was still on. So, maybe I’ll have to stop running the lights or talking and walking. Seems too much for me now. Is it that we are getting old, Stevie dear . . .? Cheers, Cathy As can be seen in the case above, when mobile, the user cannot pay attention to the device’s display for long without disastrous effects. This all highlights the importance of user interface and its design. 6.3.1 Why not Speech User Interfaces for Mobiles? A speech user interface, be it command-based or continuous, could partially solve the problem of continuous use with its hands- and eyes- free operation. In an SUI, the input and output devices do not require as much physical space on the device surface, and they are likely to consume less power than a display with a backlight. The system con- tains fewer mechanical parts and is easier to manufacture and thus less prone to mechanical failures. Unfortunately, current technical solutions for speech-only user interfaces are not there yet. For instance, in a mobile system for dictating short messages, native speakers can achieve over 90% word accuracy in moderately noisy environments, such as in a car, after short enrolment session (Karpov et al. 2006). This sounds high