comScore, “TabLens: Today’s U.S. tablet owner revealed,” Retrieved
 Sears, A. & Shneiderman, B., “High precision touchscreens: design
strategies and comparisons with a mouse,” International Journal of
Man-Machine Studies, vol. 34, no. 4, pp. 593-613, 1991.
 Wigdor, D. & Wixon, D., Brave NUI world: Designing natural user
interfaces, Morgan-Kaufmann, Burlington, MA. 2011.
 Varcholik, P. D., Laviola Jr. J. J., & Hughes C. E., “Establishing a
baseline for text entry for a multi-touch virtual keyboard,” International
Journal of Human-Computer Studies, vol. 70, pp. 657-672, 2012.
 Fu, C. W., Goh, W. B. & Ng, J. A., “Multi-touch techniques for exploring
large-scale 3D astrophysical simulations,” Proceedings of the 28th
International Conference on Human Factors in Computing Systems,
ACM, Atlanta, Georgia, USA, 2010.
 Google, “Tablet Survey March 2011,” Retrieved from
 Müller, H., Gove, J., & Webb, J., “Understanding tablet use: A
multi-method exploration,” Proceedings of the 14th international
conference on human-computer interaction with mobile devices and
services, 2012, pp. 1-10, ACM.
 MacKenzie, I.S., Zhang, S.X., & Soukoreff, R.W., “Text entry using soft
keyboards,” Behaviour and Information Technology, vol. 18, no. 4, pp.
 Wu, C. F., Lien, C. M., & Kuo, F. C., “Performance study of the tangible
keyboard and touch keyboard operation,” International Journal of Kansei
Information, vol. 4, no. 1, pp. 21-28, 2013.
 MacKenzie, I.S., Nonnecke, B., McQueen, C., Riddersma, S., & Meltz,
M., “Alphanumeric entry on pen-based computers,” International
Journal of Human-Computer Studies, vol. 41, pp. 775–792, 1994.
 MacKenzie, I.S., & Zhang, S.X., “An empirical investigation of the
novice experience with soft keyboards,” Behaviour and Information
Technology, vol. 20, no. 6, pp. 411–418, 2001.
 MacKenzie, I.S., & Soukoreff, R.W., “Text entry for mobile computing:
models and methods, theory and practice,” Human–Computer
Interaction, vol. 17, no. 2 and no. 3, pp. 147–198, 2002a.
 MacKenzie, I.S., & Soukoreff, R.W., “A model of two-thumb text entry,”
Graphics Interface, pp. 117–124, 2002b.
 MacKenzie, I.S., & Soukoreff, R.W., “Phrase sets for evaluating text
entry techniques,” CHI ’03 extended abstracts on human factors in
computing systems, ACM, Ft. Lauderdale, Florida, USA, 2003.
 Okayasu, K., Iwanaga, K., Harada, H., & Katsuura, T., “Interface design
using tactile detection: Key shapes as input devices,” Proceedings of the
Annual Conference of JSSD, vol. 45, 1998, pp. 122-123.
 Deininger, R. L., “Human factors engineering studies of the design and
use of pushbutton telephone sets,” The Bell Systems Technical Journal,
vol. 39, pp. 995-1012, 1960.
 Kinkead, R. D. & Gonzalez, B. K., Human factors design
recommendations for touch-operated keyboards - final report (Document
12091-FR), Minneapolis, MN: Honeywell, Inc., 1969.
 Lai, C. C. & Wu, C. F., “Display and device size effects on the usability of
mini-notebooks (netbooks)/ ultraportables as small form-factor Mobile
PCs,” Applied Ergonomics, vol. 45, no. 4, pp. 1-10, 2014.
 3G Technology Inc., “Principles of slim keyboard design,” Retrieved
from http://www.3gi.com.tw/about.asp, 2013.
 Box, G. E., & Wilson, K. B., “On the experimental attainment of optimum
conditions,” Journal of the Royal Statistical Society, Series B
(Methodological), vol. 13, no. 1, pp. 1-45, 1951.
 Burdick, R. K., Borror, C. M., & Montgomery, D. C., Design and analysis
of Gauge R and R studies: making decisions with confidence intervals in
random and mixed ANOVA models, 2005, ch. 17, SIAM.
 Wobbrock, J. O., Measures of text entry performance, 2007, pp. 47-74,
San Francisco: Morgan Kaufmann.
 Cohen, K. M., “Human Factors and Behavioral Science: Membrane
keyboards and human performance,” The Bell System Technical Journal,
vol. 62, no. 6, pp. 1733-1749, 1982.
 Pollard, D. & Cooper, M. B., “The effect of feedback on keying
performance,” Applied Ergonomics, vol. 10, no.4, pp. 194-200, 1979.
 Pereira, A., Lee, D. L., Sadeeshkumar, H., Laroche, C., Odell, D.,
Rempel, D., “The effect of keyboard key spacing on typing speed, error,
usability, and biomechanics: part 1,” Human Factors: The Journal of the
Human Factors and Ergonomics Society, vol. 55, no. 3, pp. 557-566,
 Loricchio, D., “Key force and typing performance,” Proceedings of the
Human Factors Society 36th Annual Meeting, 1992, pp. 281-282, Santa
Monica, CA: Human Factors Society.
 Akagi, K., “A computer keyboard key feel study in performance and
preference,” Proceedings of the Human Factors Society 36th Annual
Meeting, 1992, pp. 523-527. Santa Monica, CA: Human Factors Society.
 Lewis, J. R., Potosnak, K. M., & Magyar, R. L., Handbook of
human-computer interaction (2nd edition), 1997, pp. 1285-1315.