Comparison of two touchpad-based methods for numeric entry

ABSTRACT

Small hand-held touchpads can be used to replace stylus-based digitizing tablets when the use of a stylus is not convenient. In text entry tasks where the writing surface is held in a hand the error rate becomes a problem. The small size of strokes compared to the width of the fingertip and the additional imprecision caused by the interaction of the pad and finger movements make input very imprecise. We describe a new improved clock-face based stroke system for entering numbers with a touchpad. In a 20-session user study with 6 users we found slightly better throughput of successfully entered numbers with the proposed new system. This advantage was mainly due to lower error rate with the new system. User preference similarly slightly favored the new system over an earlier straightforward proposal based on the clock metaphor

REFERENCES

• 1: 3Com Corporation, Graffiti. http://www.palm.com/products/input/
• 2: Johnny Accot , Shumin Zhai, Beyond Fitts' law: models for trajectory-based HCI tasks, Proceedings of the SIGCHI conference on Human factors in computing systems, p.295-302, March 22-27, 1997, Atlanta, Georgia, United States [doi>10.1145/258549.258760]
• 3: Johnny Accot , Shumin Zhai, Performance evaluation of input devices in trajectory-based tasks: an application of the steering law, Proceedings of the SIGCHI conference on Human factors in computing systems: the CHI is the limit, p.466-472, May 15-20, 1999, Pittsburgh, Pennsylvania, United States [doi>10.1145/302979.303133]
• 4: Bangay, S. Cirque Cat Driver for Linux. Available at http://cs.ru.ac.za/homes/cssb/cirque/
• 5: J. Callahan , D. Hopkins , M. Weiser , B. Shneiderman, An empirical comparison of pie vs. linear menus, Proceedings of the SIGCHI conference on Human factors in computing systems, p.95-100, May 15-19, 1988, Washington, D.C., United States [doi>10.1145/57167.57182]
• 6: e-acute, Octave User's Manual. Available at http://www.e-acute.fr/English/manual/manualV1.html
• 7: Mary LaLomia, User acceptance of handwritten recognition accuracy, Conference companion on Human factors in computing systems, p.107-108, April 24-28, 1994, Boston, Massachusetts, United States [doi>10.1145/259963.260086]
• 8: Neil R. N. Enns , I. Scott MacKenzie, Touchpad-based remote control devices, CHI 98 conference summary on Human factors in computing systems, p.229-230, April 18-23, 1998, Los Angeles, California, United States [doi>10.1145/286498.286717]
• 9: David Goldberg , Cate Richardson, Touch-typing with a stylus, Proceedings of the SIGCHI conference on Human factors in computing systems, p.80-87, April 24-29, 1993, Amsterdam, The Netherlands [doi>10.1145/169059.169093]
• 10: Poika Isokoski, Model for unistroke writing time, Proceedings of the SIGCHI conference on Human factors in computing systems, p.357-364, March 2001, Seattle, Washington, United States [doi>10.1145/365024.365299]
• 11: Poika Isokoski , Roope Raisamo, Device independent text input: a rationale and an example, Proceedings of the working conference on Advanced visual interfaces, p.76-83, May 2000, Palermo, Italy [doi>10.1145/345513.345262]
• 12: Gordon Kurtenbach , William Buxton, User learning and performance with marking menus, Proceedings of the SIGCHI conference on Human factors in computing systems: celebrating interdependence, p.258-264, April 24-28, 1994, Boston, Massachusetts, United States [doi>10.1145/191666.191759]
• 13: Gordon Kurtenbach , William Buxton, The limits of expert performance using hierarchic marking menus, Proceedings of the SIGCHI conference on Human factors in computing systems, p.482-487, April 24-29, 1993, Amsterdam, The Netherlands [doi>10.1145/169059.169426]
• 14: Kurtenbach, G., Sellen, A., and Buxton, B. An Empirical Evaluation of Some Articulatory and Cognitive Aspects of Marking Menus. Human-Computer Interaction, 8, 1--23, 1993.
• 15: I. Scott MacKenzie , Blair Nonnecke , Stan Riddersma , Craig McQueen , Malcolm Meltz, Alphanumeric entry on pen-based computers, International Journal of Human-Computer Studies, v.41 n.5, p.775-792, Nov. 1994 [doi>10.1006/ijhc.1994.1081]
• 16: Jennifer Mankoff , Gregory D. Abowd, Cirrin: a word-level unistroke keyboard for pen input, Proceedings of the 11th annual ACM symposium on User interface software and technology, p.213-214, November 01-04, 1998, San Francisco, California, United States [doi>10.1145/288392.288611]
• 17: McQueen, C., MacKenzie, I.S., and Zhang, S.X. An Extended Study of Numeric Entry on Pen-Based Computers. Proc. of Graphics Interface '95, 215--222, Canadian Information Processing Society, 1995.
• 18: Ken Perlin, Quikwriting: continuous stylus-based text entry, Proceedings of the 11th annual ACM symposium on User interface software and technology, p.215-216, November 01-04, 1998, San Francisco, California, United States [doi>10.1145/288392.288613]
• 19: Dan Venolia , Forrest Neiberg, T-Cube: a fast, self-disclosing pen-based alphabet, Proceedings of the SIGCHI conference on Human factors in computing systems: celebrating interdependence, p.265-270, April 24-28, 1994, Boston, Massachusetts, United States [doi>10.1145/191666.191761]

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.4 Graphics Utilities
          Subjects: Virtual device interfaces

Additional Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES
      H.1.2 User/Machine Systems
          Subjects: Human factors
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)
          Subjects: Input devices and strategies (e.g., mouse, touchscreen)

General Terms:
Human Factors, Performance, Theory

Keywords:
clock metaphor, mobile devices, stylus overhead, writing