This morning, I read an interesting discussion of Pentagram’s UI overhaul for Wells Fargo ATMs. You generally don’t see a lot of discussion of the unique UI design challenges inherent in working with a touch screen or kiosk. A kiosk user experience generally needs to be a very quick one, thus the number of choices and steps should be reduced to a bare minimum. Simplicity is key. And visual design can be challenging, since our fingers require much larger buttons than a mouse pointer does. While these issues aren’t addressed specifically in the article, it’s still nice to see a case study of what goes into this kind of design.