Apprehension is the enemy of interface design
"Go to your local grocery story or Home Depot, or whoever else has self checkout and just watch. Watch for about 10 minutes. You’ll see the physical manifestation of apprehension caused by people interacting with machine-based interfaces.
You’ll see lots of squinting, lots of “almost pushed” buttons, lots of hand sliding and gliding (when someone moves their hand around the screen seeking out the button the want to press), lots of slow motion (“the slower I go the less mistakes I can make”), lots of corner-eye looks to see what everyone else is doing, and lots of quick pull aways. It’s as if the faster you pull your hand away from the screen the less likely the machine will think you meant to do something wrong.
Apprehension is the enemy of interface design. Like Krug says, Don’t Make Me Think. Any thinking also includes a thought about trying something different, the opportunity cost of pressing this over that, and, worst of all, the thought of bail out." continued ... (Via 37signals)

Self Scanner.











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