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Observation, user, 101–102
Office applications, 29
Ohno, Taiichi, 231, 242
One-hand use, 144
One-line layouts, 54
One-row keyboard, 157–168
dedicated keys on, 161–162
first evaluations of, 163–165
first prototype for, 162
lessons learned from, 166–168
origin of concept, 157–160
potential benefits of, 160–161
preliminary usability testing for, 151
second evaluations of, 165–166
second prototype for, 164–165
typing with, 163–166
One-softkey style, 70
(See also Navi-key)
Open Mobile Alliance, 283–284
Opportunistic actions, 239–240
Option lists, 54–55
Orientation applications, 107–108
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