Usability evaluation of randomized keypad
Young Sam Ryu, Do Hyong Koh, Brad L. Aday, Xavier A. Gutierrez, J. D. Platt · 2010
In this work, the usability of a randomized numeric keypad was examined and compared to the usability of a conventional numeric keypad. The comparison used completion time measurements and the error rate of short (4-digit) and long (8-digit) PINs to contrast efficiency and accuracy of the keypads. The results showed that the average completion time with a randomized keypad is longer than with a conventional keypad. Additionally, the number of errors with a randomized keypad was significantly higher than with a conventional keypad, particularly when using long PINs. Accordingly, a randomized numeric keypad is more applicable to tasks with short (4-digit) PINs.