Whether abilities are congenital or acquired, the theory of Universal Design focuses on the customer. The accessibility movement seeks public accommodations for persons with disabilities. Not surprising, wider doorways, ramps and stair railings also benefit people without disabilities. The speaker phone is used in automobiles, homes and conference rooms for three different reasons. Pocket-sized electronic devices may be useless for older persons with vision loss or impaired dexterity. Consideration of the consumer's mental, physical and sensory abilities contributes to the success of the...