Watching store/restaurant employees use infrared touch-screen point-of-sale (POS) terminals. The old technology isn’t always very responsive, often has low-resolution input, and runs slowly. Thus the following observed accommodation behaviors:

• Using a credit card instead of a finger
• Cutting fingernails to different lengths
• Pressing harder (irrelevant to an IR technology!)
• Pressing longer
• Pressing more often
• On the software end, designing extra-large icons, to reduce false positive inputs