Letterscroll: text entry using a wheel for visually impaired users

Authors:
Hussain Tinwala;I. Scott MacKenzie
Affiliations:
York University, Toronto, ON, Canada;York University, Toronto, ON, Canada
Venue:
CHI '08 Extended Abstracts on Human Factors in Computing Systems
Year:
2008

Citing 4
Cited 0

Predicting text entry speed on mobile phones

Proceedings of the SIGCHI conference on Human Factors in Computing Systems
Mobile text entry using three keys

Proceedings of the second Nordic conference on Human-computer interaction
KSPC (Keystrokes per Character) as a Characteristic of Text Entry Techniques

Mobile HCI '02 Proceedings of the 4th International Symposium on Mobile Human-Computer Interaction
Phrase sets for evaluating text entry techniques

CHI '03 Extended Abstracts on Human Factors in Computing Systems

Quantified Score

Hi-index	0.00

Visualization

Abstract

Four text entry techniques for visually impaired users are presented. LetterScroll uses a mouse wheel to maneuver a cursor across a sequence of characters, and a button for character selection. Keystrokes per character (KSPC) vary from 6.97 to 2.68. After extensive analyses and pilot testing, two variations were chosen for initial evaluation. Method 1 (M1) uses the mouse alone to enter text. Method 4 (M4) also uses the keyboard to access vowels. In a study with seven blindfolded participants, entry rates averaged 2.9 wpm for M1 and 4.4 wpm for M4. Error rates for both methods were about 3.4%.