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R&D (see Research and development)
Reachability, 115–116
Replacement customers, 36, 37, 41–42
Research:
behavioral, 136
consumer studies, 113–128
contextual, 136
cultural end-user, 97–110
discount methods for, 134–135
engineering/design issues in, 133–134
expert knowledge in, 134
improving validity of, 135
international, 135
lifestyle factors in, 117
proactive, 137
quick and dirty, 172
subjects of study for, 124
Research and development (R&D), 140–141
Resolution, display, 36–37
Response times, 221
Responsibility:
for quality, 237
for user interface development, 284
Responsive usability engineering, 136–137
Rich call, 28, 230
Rieman, John, 233
Ringo phone, 74, 82
Roadmap, UI, 151
Rollers, 40
Rome, test tour in (see Paper prototyping)
“Rough and dirty,” 172, 278–279
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