Correct design only obvious after testing with people
The user testing that produced the telephone keyboard that, in hindsight, seems like the only reasonable solution https://t.co/lKd2NUVoPp
— John Lee (@Jdlee888) April 1, 2017
Telephone keypad layouts seem intuitive now but weren't inevitable. @KurtKohlstedt explores a number of alternatives https://t.co/7dRBAB9QUS
— 99 Percent Invisible (@99piorg) March 31, 2017
