After twenty or so boxes and taps, the “game” would end, and the app would show you your score: how many boxes you hit and how many you missed. Behind the scenes, the software tracked the sizes of the boxes and their location. Since it was a fun game to play … ahem … a serious test program to gather essential touchscreen usability data, the Herz tap app made a quick round of the Purple hallway. Within a few days, we had quite a bit of information about tap-target sizes and accuracy.
