Will they use it? Will it be useful? In-Situ Evaluation of a Tactile Car Finder.

When we develop new technology, we want to know if it will have the potential to be successful in the real world.

This is not trivial! People may sincerely enjoy our technology when we expose them to it in a lab- or a field study. They may perform better than with previous solutions at the tasks that we ask them to fulfill as part of the study.

However, once they leave our lab they never again encounter the need to use it in their daily routines. Or, the utility we prove in our studies may not be evident in the contexts where this technology is actually deployed.

In our work, we made use of Google Play to answer these questions in a novel way. We wanted to study if a haptic feedback can make people less distracted from the environment, when they use their phone for pedestrian navigation in daily life. We developed a car finder application for Android phones with a simple haptic interface: whenever the user points into the direction of the car, the phone vibrates.

The data provides evidence that about half of the users use the vibration feedback. When vibration feedback is enabled, users turn off the display and stow away the device more often. They also look less at the display. Hence, when using vibration feedback, users are less distracted.

Our work shows that app distribution channels, such as Google Play or the iOS Store, can serve as a cheap way of bringing a user study into the daily life of people instead of bringing people into the lab. Compared to the results of a lab study, these findings have high external validity, i.e. we can be sure that our findings can be generalized to a large number of users and usage situations.

This work will be presented at NordiCHI ’12: The 7th Nordic Conference on Human-Computer Interaction, which takes place in Copenhagen in October 2012. The paper is available here (pdf).

Thanks to http://www.v3.co.uk/ for summarising this work so nicely in their article Buzzing app helps smartphone dudes locate their car.

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