Swiss Usability Blog
by Andreas Bossard

Safeword token: 5 or S? 0 or O?

If Safeword would have done only 3 usability-tests, they would have seen, that it’s hard to see the difference between the number “5” and the letter “S” or between the number “0” (zero) and the letter “O”.

5 or S? 0 or O?

From some testing until now, I am almost sure that these two characters are always numbers and not letters. But I catch myself regularly pressing the randomizer-button until a set of characters appears that do not contain 5 or 0…


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