Designing for the Life Span Segment 4
Designing for the Life Span Segment 4 
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[D]
The Touch-Tone Phone, for all of its speed and convenience, presents specific legibility problems and an increased error rate for the all users of the product. The voice mail machines have added a valuable new dimension to telephone communications, but are not "intuitive" to operate.
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Telephones have become less and less a device that is related to listening and speaking. The older "slim-line" phone in this slide maintains some of this relationship but newer cellular phones are tiny, confusingly multi-functional and even harder to operate for those having arthritis problems or tremor.
The answering machine has also become a fixture, either as part of the phone itself or as a separate product - as in this slide. Once again, the design of the product emphasizes graphic uniformity as organization rather than differentiation of the controls for proper operation.
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