"Anything more complicated, and your design can only be used by people with [decent computer skills] meaning that you’re down to serving 31% of the population in the United States, 35% in Japan and the UK, 37% in Canada and Singapore, and 38% in Northern Europe and Australia. Again, the international variations don’t matter much relative to the big-picture conclusion: keep it extremely simple, or two thirds of the population can’t use your design."
the vast majority of people are illiterate. this doesn't bode well for their future job prospects.
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