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virtual keyboard layout for vending machine

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From: Michael Stenitzer
Date: May 16, 2016 8:36AM

hello all,

we are helping to design a "simple mode" for a ticket vending machine with
a 14'' touch screen:
* easy to understand + step by step ticket selection process
* large text
* high contrast

our target groups include people with low vision as well as people with low
literacy / low digital literacy, people with cognitive disabilities ...

some interfaces need a virtual keyboard to enter origin and destination for
a trip. in the standard mode a normal QWERTY / QWERTZ layout will be
provided.

for the simple mode we consider using a different virtual keyboard layout,
eg an A-Z ordered layout.

does anyone of you has experience, links or thoughts that might help to
decide?

thx, michael