In addition to user testing, we also conducted 2 rounds of diary studies to discover how people use mobile devices in their everyday life. One diary study was in the U.S.; the other included participants from Australia, The Netherlands, Romania, Singapore, the U.K., and the U.S. In total, 27 people participated in the diary studies, providing us data about 172 person-days of mobile activities. Again, participants had a wide range of jobs, from bookkeeper to football coach.