Title page for ETD etd-04072009-040807
|Type of Document
||Leahy, Michael Randolph
||Empirically derived guidelines for touch screen targets
||Master of Science
||Computer Science and Applications
|No Advisors Found
- HP Touchscreen computers.
|Date of Defense
Users are often frustrated when a touch screen monitor inaccurately records their
touches. Enlarging touch sensitive regions improves touch accuracy, but few specific guidelines
are available in the literature. A controlled field experiment determined the effect of target
location and visual target size on user accuracy and empirically derived quantitative guidelines
for determining touch target size based. on target location. The experiment was conducted in a
grocery store using a piezo-electric monitor in a public access kiosk. Participants pressed the
screen as target squares appeared one at a time. Visual target size, horizontal viewing location,
and screen sector of target were varied. X and Y offset between the target center and the touch
location were recorded. Results showed Significant differences caused by target sector in X
offsets among columns and in Y offsets among rows, but no differences caused by target size.
Results showed that persons tended to touch below the target, with touch distance increasing as
the location of the target moved down the screen. To a lesser extent, persons tended to touch
toward the sides of the screen. Using collected data for each of nine screen sectors, graphs were
prepared showing the relationship between touch target size and expected accuracy under harsh
conditions. These empirically derived, quantitative guidelines will help designers plan for the
worst case and create screens that decrease user errors and frustration.
|| Approximate Download Time
| 28.8 Modem
|| 56K Modem
|| ISDN (64 Kb)
|| ISDN (128 Kb)
|| Higher-speed Access
next to an author's name indicates that all
files or directories associated with their ETD
are accessible from the Virginia Tech campus network only.
If you have questions or technical
problems, please Contact DLA.