International Journal of Man-Machine Studies, (1991) 34, 4, 593-613. Also Sparks of Innovation in Human-Computer Interaction, Shneiderman, B., Ed., Ablex (June 1993) 171-185.
HCIL-89-17, CS-TR-2268, CAR-TR-450
Three studies were conducted comparing speed of performance, error
rates, and user preference ratings for three selection devices. The devices tested were a touchscreen, a touchscreen with stabilization (stabilization software filters and smooths raw da
ta from hardware), and a mouse. The task was the selection of rectangular targets 1,4,16,32 pixels per side (0.4x0.6, 1.7x2.2, 6.9x9.0, 13.8x17.9 mm respectively). Touchscreen users were able to point at single pixel targets, thereby countering widespre
ad expectations of poor touchscreen resolution. The results show no difference in performance between the mouse and touchscreen for targets ranging from 32 to 4 pixels per side. In addition, stabilization significantly reduced the error rates for the to
uchscreen when selecting small targets. These results imply that touchscreens, when properly used, have attractive advantages in selecting targets as small as 4 pixels per size (approximately one-quarter of the size of a single character). Ideas for fut
ure research are presented.