The Hidden Cost of Touchscreens

Tesla’s 2012 touchscreen display (via Car Connection)

Serious interfacesthose that are repeatedly used by a knowledgeable professional and/or in potentially hazardous situations, should not be touchscreen based. If a touchscreen must be used, it should be embedded alongside a set of fixed, physical buttons that support muscle memory and single actions.

Example of an image-based touchscreen point of service system
Example POS system that is ugly but functional: High contrast, color-coded buttons take less time to mentally digest.

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A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store