There is a growing debate in the literature regarding the tradeoffs between lab and field evaluation of mobile devices. This paper\r\npresents a comparison of field-based and lab-based experiments to evaluate user experience of personalised mobile devices at\r\nlarge sports events. A lab experiment is recommended when the testing focus is on the user interface and application-oriented\r\nusability related issues. However, the results suggest that a field experiment is more suitable for investigating a wider range of\r\nfactors affecting the overall acceptability of the designed mobile service. Such factors include the system function and effects of\r\nactual usage contexts aspects. Where open and relaxed communication is important (e.g., where participant groups are naturally\r\nreticent to communicate), this is more readily promoted by the use of a field study.
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