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Self-service parking attendant

(picture of parking attendent) This picture shows a self-service device to pay to park in an unattended parking lot. You need to fold up dollar bills and stuff them "upwards" into the numbered slot corresponding to your parking space. To fit, a dollar bill has to be folded over three times. It isn't easy. Imagine someone with arthritis trying to do this.

Design suggestion

When you design something you need to think about the great differences in the capabilities of the people that will need to use it.

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